LLM Frontier: frontier advanceshttps://llm-frontier.catalystneuro.com/feed.xml2026-10-16T06:00:00ZCatalystNeuroEach entry is a date on which a model became the cheapest way to reach some level of the Artificial Analysis Intelligence Index, through a release or a price change.2026-10-07: Claude Haiku 5.5 (Xhigh) (new model, index 41.2)https://llm-frontier.catalystneuro.com/advance/2026-10-07/claude-haiku-5-5-xhigh2026-10-07T00:00:00ZClaude Haiku 5.5 (Xhigh): now the cheapest way to reach index 38.1 to 41.2 at $0.12 per task, taking it from GPT-6.1 Sol. Proprietary.2026-10-01: GPT-6 Luna (Max) (price change, index 38.1)https://llm-frontier.catalystneuro.com/advance/2026-10-01/gpt-6-luna2026-10-01T00:00:00ZGPT-6 Luna (Max): price moved from $0.068 to $0.068 per task; now the cheapest way to reach index 37.9 to 38.1, taking it from GPT-6.1 Sol. Proprietary.2026-09-29: GPT-6.1 Sol (Max) (new model, index 51.8)https://llm-frontier.catalystneuro.com/advance/2026-09-29/gpt-6-1-sol2026-09-29T00:00:00ZGPT-6.1 Sol (Max): now the cheapest way to reach index 51.0 to 51.8 at $0.72 per task, taking it from Claude Opus 5.5. Proprietary.2026-09-29: GPT-6.1 Sol (Xhigh) (new model, index 51.0)https://llm-frontier.catalystneuro.com/advance/2026-09-29/gpt-6-1-sol-xhigh2026-09-29T00:00:00ZGPT-6.1 Sol (Xhigh): now the cheapest way to reach index 50.2 to 51.0 at $0.39 per task, taking it from Claude Opus 5.5. Proprietary.2026-09-29: GPT-6.1 Sol (High) (new model, index 50.2)https://llm-frontier.catalystneuro.com/advance/2026-09-29/gpt-6-1-sol-high2026-09-29T00:00:00ZGPT-6.1 Sol (High): now the cheapest way to reach index 47.8 to 50.2 at $0.32 per task, taking it from Claude Opus 5.5. New cost record for index ≥ 50. Proprietary.2026-09-29: GPT-6.1 Sol (Medium) (new model, index 47.8)https://llm-frontier.catalystneuro.com/advance/2026-09-29/gpt-6-1-sol-medium2026-09-29T00:00:00ZGPT-6.1 Sol (Medium): now the cheapest way to reach index 46.3 to 47.8 at $0.21 per task, taking it from Claude Opus 5.5 and GPT-6 Sol; GPT-6 Sol left the frontier. Proprietary.2026-09-29: GPT-6.1 Sol (Low) (new model, index 42.1)https://llm-frontier.catalystneuro.com/advance/2026-09-29/gpt-6-1-sol-low2026-09-29T00:00:00ZGPT-6.1 Sol (Low): now the cheapest way to reach index 37.9 to 42.1 at $0.13 per task, taking it from MiMo-V2.6-Pro. Proprietary.2026-09-22: Claude Opus 5.5 (Max, Default Fallback) (new model, index 57.6)https://llm-frontier.catalystneuro.com/advance/2026-09-22/claude-opus-5-52026-09-22T00:00:00ZClaude Opus 5.5 (Max, Default Fallback): pushed the intelligence ceiling from 53.4 to 57.6, at $5.98 per task. Proprietary.2026-09-22: Claude Opus 5.5 (Xhigh, Default Fallback) (new model, index 56.0)https://llm-frontier.catalystneuro.com/advance/2026-09-22/claude-opus-5-5-xhigh2026-09-22T00:00:00ZClaude Opus 5.5 (Xhigh, Default Fallback): pushed the intelligence ceiling from 53.4 to 56.0, at $3.46 per task. Proprietary.2026-09-22: Claude Opus 5.5 (High, Default Fallback) (new model, index 53.6)https://llm-frontier.catalystneuro.com/advance/2026-09-22/claude-opus-5-5-high2026-09-22T00:00:00ZClaude Opus 5.5 (High, Default Fallback): pushed the intelligence ceiling from 53.4 to 53.6, at $1.82 per task, taking it from Claude Fable 5.1 and GPT-6 Astra, both of which left the frontier. Proprietary.2026-09-22: Claude Opus 5.5 (Medium, Default Fallback) (new model, index 51.2)https://llm-frontier.catalystneuro.com/advance/2026-09-22/claude-opus-5-5-medium2026-09-22T00:00:00ZClaude Opus 5.5 (Medium, Default Fallback): now the cheapest way to reach index 47.5 to 51.2 at $1.34 per task, taking it from GPT-6 Astra. Proprietary.2026-09-22: GPT-6 Sol (Max) (new model, index 47.5)https://llm-frontier.catalystneuro.com/advance/2026-09-22/gpt-6-sol2026-09-22T00:00:00ZGPT-6 Sol (Max): now the cheapest way to reach index 46.3 to 47.5 at $1.06 per task, taking it from GPT-6 Astra. Proprietary.2026-09-22: GPT-6 Luna (Xhigh) (new model, index 33.9)https://llm-frontier.catalystneuro.com/advance/2026-09-22/gpt-6-luna-xhigh2026-09-22T00:00:00ZGPT-6 Luna (Xhigh): now the cheapest way to reach index 32.1 to 33.9 at $0.042 per task, taking it from MiMo-V2.6-Flash. Proprietary.2026-09-22: GPT-6 Luna (High) (new model, index 32.1)https://llm-frontier.catalystneuro.com/advance/2026-09-22/gpt-6-luna-high2026-09-22T00:00:00ZGPT-6 Luna (High): now the cheapest way to reach index 29.5 to 32.1 at $0.029 per task, taking it from GPT-5.6 Luna. New cost record for index ≥ 30. Proprietary.2026-09-22: GPT-6 Luna (Medium) (new model, index 29.5)https://llm-frontier.catalystneuro.com/advance/2026-09-22/gpt-6-luna-medium2026-09-22T00:00:00ZGPT-6 Luna (Medium): now the cheapest way to reach index 25.0 to 29.5 at $0.017 per task, taking it from GPT-5.6 Luna. Proprietary.2026-09-22: GPT-6 Luna (Low) (new model, index 20.9)https://llm-frontier.catalystneuro.com/advance/2026-09-22/gpt-6-luna-low2026-09-22T00:00:00ZGPT-6 Luna (Low): now the cheapest way to reach index 0.0 to 20.9 at $0.0045 per task, taking it from GPT-5.6 Luna and Granite 4.2 3B; Granite 4.2 3B left the frontier. Proprietary.2026-09-21: MiMo-V2.6-Pro (new model, index 46.3)https://llm-frontier.catalystneuro.com/advance/2026-09-21/mimo-v2-6-pro2026-09-21T00:00:00ZMiMo-V2.6-Pro: now the cheapest way to reach index 37.9 to 46.3 at $0.13 per task, taking it from GPT-6 Astra, Step 5 Preview, and GLM-5.3-Flash; Step 5 Preview and GLM-5.3-Flash left the frontier. Open weights.2026-09-21: MiMo-V2.6-Flash (new model, index 37.9)https://llm-frontier.catalystneuro.com/advance/2026-09-21/mimo-v2-6-flash2026-09-21T00:00:00ZMiMo-V2.6-Flash: now the cheapest way to reach index 32.1 to 37.9 at $0.062 per task, taking it from GLM-5.3-Flash and GPT-5.6 Luna. Open weights.2026-09-18: Step 5 Preview (new model, index 43.6)https://llm-frontier.catalystneuro.com/advance/2026-09-18/step-52026-09-18T00:00:00ZStep 5 Preview: now the cheapest way to reach index 41.9 to 43.6 at $0.71 per task, taking it from GPT-6 Astra and GPT-5.6 Sol; GPT-5.6 Sol left the frontier. Open weights.2026-09-03: GPT-6 Astra (Xhigh) (new model, index 61.0)https://llm-frontier.catalystneuro.com/advance/2026-09-03/gpt-6-astra-xhigh2026-09-03T00:00:00ZGPT-6 Astra (Xhigh): now the cheapest way to reach index 60.9 to 61.0 at $1.20 per task, taking it from Claude Opus 5. Proprietary.2026-09-02: Muse Spark 1.3 (Xhigh) (new model, index 60.8)https://llm-frontier.catalystneuro.com/advance/2026-09-02/muse-spark-1-3-xhigh2026-09-02T00:00:00ZMuse Spark 1.3 (Xhigh): now the cheapest way to reach index 57.5 to 60.8 at $0.55 per task, taking it from Grok 4.6, Kimi K3, GLM-5.3, and GPT-5.6 Sol; Kimi K3, GLM-5.3, and GPT-5.6 Sol left the frontier. New cost record for index ≥ 60. Proprietary.2026-09-01: Claude Fable 5.1 (Max, Default Fallback) (new model, index 65.7)https://llm-frontier.catalystneuro.com/advance/2026-09-01/claude-fable-5-12026-09-01T00:00:00ZClaude Fable 5.1 (Max, Default Fallback): pushed the intelligence ceiling from 63.1 to 65.7, at $3.69 per task. Proprietary.2026-09-01: Claude Fable 5.1 (Xhigh, Default Fallback) (new model, index 64.8)https://llm-frontier.catalystneuro.com/advance/2026-09-01/claude-fable-5-1-xhigh2026-09-01T00:00:00ZClaude Fable 5.1 (Xhigh, Default Fallback): pushed the intelligence ceiling from 63.1 to 64.8, at $2.65 per task. Proprietary.2026-09-01: Claude Fable 5.1 (High, Default Fallback) (new model, index 62.5)https://llm-frontier.catalystneuro.com/advance/2026-09-01/claude-fable-5-1-high2026-09-01T00:00:00ZClaude Fable 5.1 (High, Default Fallback): now the cheapest way to reach index 61.5 to 62.5 at $1.43 per task, taking it from Claude Opus 5. Proprietary.2026-08-28: GPT-5.6 Sol (Xhigh) (price change, index 59.0)https://llm-frontier.catalystneuro.com/advance/2026-08-28/gpt-5-6-sol-xhigh2026-08-28T00:00:00ZGPT-5.6 Sol (Xhigh): price moved from $0.671 to $0.63 per task; now the cheapest way to reach index 57.5 to 59.0. Proprietary.2026-08-26: GLM-5.3-Flash (new model, index 57.5)https://llm-frontier.catalystneuro.com/advance/2026-08-26/glm-5-3-flash2026-08-26T00:00:00ZGLM-5.3-Flash: now the cheapest way to reach index 52.3 to 57.5 at $0.087 per task, taking it from GPT-5.6 Sol, Muse Spark 1.2, Grok 4.5, Gemini 3.7 Flash, and DeepSeek V4 Pro 0813; Muse Spark 1.2, Grok 4.5, Gemini 3.7 Flash, and DeepSeek V4 Pro 0813 left the frontier. Open weights.2026-08-26: Agnes 2.5 Pro Beta (new model, index 49.1)https://llm-frontier.catalystneuro.com/advance/2026-08-26/agnes-2-5-pro-beta2026-08-26T00:00:00ZAgnes 2.5 Pro Beta: now the cheapest way to reach index 47.0 to 49.1 at $0.027 per task, taking it from GPT-5.6 Luna. Proprietary.2026-08-25: GPT-5.6 Sol (Xhigh) (price change, index 59.0)https://llm-frontier.catalystneuro.com/advance/2026-08-25/gpt-5-6-sol-xhigh2026-08-25T00:00:00ZGPT-5.6 Sol (Xhigh): price moved from $0.807 to $0.64 per task; now the cheapest way to reach index 57.3 to 59.0, taking it from Grok 4.6. Proprietary.2026-08-25: GPT-5.6 Sol (High) (price change, index 57.3)https://llm-frontier.catalystneuro.com/advance/2026-08-25/gpt-5-6-sol-high2026-08-25T00:00:00ZGPT-5.6 Sol (High): price moved from $0.548 to $0.43 per task; now the cheapest way to reach index 56.8 to 57.3. Proprietary.2026-08-25: GPT-5.6 Sol (Medium) (price change, index 55.6)https://llm-frontier.catalystneuro.com/advance/2026-08-25/gpt-5-6-sol-medium2026-08-25T00:00:00ZGPT-5.6 Sol (Medium): price moved from $0.372 to $0.30 per task; now the cheapest way to reach index 53.4 to 55.6, taking it from Grok 4.5. Proprietary.2026-08-25: Granite 4.2 3B (new model, index 14.3)https://llm-frontier.catalystneuro.com/advance/2026-08-25/granite-4-2-3b2026-08-25T00:00:00ZGranite 4.2 3B: now the cheapest way to reach index 0.0 to 14.3 at $0.0047 per task, taking it from GPT-5.6 Luna and Gemma 4 E4B; Gemma 4 E4B left the frontier. Open weights.2026-08-18: GLM-5.3 (Max) (new model, index 59.5)https://llm-frontier.catalystneuro.com/advance/2026-08-18/glm-5-32026-08-18T00:00:00ZGLM-5.3 (Max): now the cheapest way to reach index 59.0 to 59.5 at $0.68 per task, taking it from Grok 4.6. Open weights.2026-08-13: Gemini 3.7 Flash (medium) (new model, index 53.4)https://llm-frontier.catalystneuro.com/advance/2026-08-13/gemini-3-7-flash-medium2026-08-13T00:00:00ZGemini 3.7 Flash (medium): now the cheapest way to reach index 53.2 to 53.4 at $0.26 per task, taking it from Grok 4.5. Proprietary.2026-08-13: DeepSeek V4 Pro 0813 (Max) (new model, index 53.2)https://llm-frontier.catalystneuro.com/advance/2026-08-13/deepseek-v4-pro2026-08-13T00:00:00ZDeepSeek V4 Pro 0813 (Max): now the cheapest way to reach index 52.3 to 53.2 at $0.25 per task, taking it from Muse Spark 1.1, which left the frontier. Open weights.2026-08-12: Grok 4.6 (High) (new model, index 60.9)https://llm-frontier.catalystneuro.com/advance/2026-08-12/grok-4-62026-08-12T00:00:00ZGrok 4.6 (High): now the cheapest way to reach index 59.0 to 60.9 at $0.84 per task, taking it from Claude Opus 5 and Kimi K3; Kimi K3 left the frontier. New cost record for index ≥ 60. Proprietary.2026-08-12: Grok 4.6 (Medium) (new model, index 59.0)https://llm-frontier.catalystneuro.com/advance/2026-08-12/grok-4-6-medium2026-08-12T00:00:00ZGrok 4.6 (Medium): now the cheapest way to reach index 57.3 to 59.0 at $0.67 per task, taking it from GPT-5.6 Sol and Claude Opus 5. Proprietary.2026-08-05: Muse Spark 1.2 (Xhigh) (new model, index 56.8)https://llm-frontier.catalystneuro.com/advance/2026-08-05/muse-spark-1-22026-08-05T00:00:00ZMuse Spark 1.2 (Xhigh): now the cheapest way to reach index 55.8 to 56.8 at $0.40 per task, taking it from GPT-5.6 Sol and GPT-5.6 Terra; GPT-5.6 Terra left the frontier. Proprietary.2026-07-30: GPT-5.6 Terra (Max) (price change, index 56.6)https://llm-frontier.catalystneuro.com/advance/2026-07-30/gpt-5-6-terra2026-07-30T00:00:00ZGPT-5.6 Terra (Max): price moved from $0.635 to $0.51 per task; now the cheapest way to reach index 55.8 to 56.6, taking it from GPT-5.6 Sol. Proprietary.2026-07-30: GPT-5.6 Luna (Max) (price change, index 52.3)https://llm-frontier.catalystneuro.com/advance/2026-07-30/gpt-5-6-luna2026-07-30T00:00:00ZGPT-5.6 Luna (Max): price moved from $0.236 to $0.047 per task; now the cheapest way to reach index 50.1 to 52.3, taking it from GPT-5.6 Sol. Proprietary.2026-07-30: GPT-5.6 Luna (Xhigh) (price change, index 50.1)https://llm-frontier.catalystneuro.com/advance/2026-07-30/gpt-5-6-luna-xhigh2026-07-30T00:00:00ZGPT-5.6 Luna (Xhigh): price moved from $0.158 to $0.032 per task; now the cheapest way to reach index 47.0 to 50.1. New cost record for index ≥ 50. Proprietary.2026-07-30: GPT-5.6 Luna (High) (price change, index 47.0)https://llm-frontier.catalystneuro.com/advance/2026-07-30/gpt-5-6-luna-high2026-07-30T00:00:00ZGPT-5.6 Luna (High): price moved from $0.108 to $0.022 per task; now the cheapest way to reach index 38.9 to 47.0, taking it from DeepSeek V4 Pro 0424, DeepSeek V4 Pro, and MiMo-V2.5-Pro, all of which left the frontier. New cost record for index ≥ 40. Proprietary.2026-07-30: GPT-5.6 Luna (Medium) (price change, index 38.9)https://llm-frontier.catalystneuro.com/advance/2026-07-30/gpt-5-6-luna-medium2026-07-30T00:00:00ZGPT-5.6 Luna (Medium): price moved from $0.056 to $0.011 per task; now the cheapest way to reach index 38.0 to 38.9, taking it from MiMo-V2.5-Pro. Proprietary.2026-07-30: GPT-5.6 Luna (Low) (price change, index 33.9)https://llm-frontier.catalystneuro.com/advance/2026-07-30/gpt-5-6-luna-low2026-07-30T00:00:00ZGPT-5.6 Luna (Low): price moved from $0.044 to $0.0088 per task; now the cheapest way to reach index 8.9 to 33.9, taking it from MiMo-V2.5. New cost record for index ≥ 30. Proprietary.2026-07-24: Claude Opus 5 (Max) (new model, index 63.1)https://llm-frontier.catalystneuro.com/advance/2026-07-24/claude-opus-52026-07-24T00:00:00ZClaude Opus 5 (Max): pushed the intelligence ceiling from 62.1 to 63.1, at $2.34 per task. Proprietary.2026-07-24: Claude Opus 5 (Xhigh) (new model, index 62.5)https://llm-frontier.catalystneuro.com/advance/2026-07-24/claude-opus-5-xhigh2026-07-24T00:00:00ZClaude Opus 5 (Xhigh): pushed the intelligence ceiling from 62.1 to 62.5, at $1.80 per task, taking it from Claude Fable 5, which left the frontier. Proprietary.2026-07-24: Claude Opus 5 (High) (new model, index 61.5)https://llm-frontier.catalystneuro.com/advance/2026-07-24/claude-opus-5-high2026-07-24T00:00:00ZClaude Opus 5 (High): now the cheapest way to reach index 59.7 to 61.5 at $1.23 per task, taking it from Claude Fable 5 and GPT-5.6 Sol. New cost record for index ≥ 60. Proprietary.2026-07-24: Claude Opus 5 (Medium) (new model, index 58.6)https://llm-frontier.catalystneuro.com/advance/2026-07-24/claude-opus-5-medium2026-07-24T00:00:00ZClaude Opus 5 (Medium): now the cheapest way to reach index 57.3 to 58.6 at $0.72 per task, taking it from GPT-5.6 Sol. Proprietary.2026-07-16: Kimi K3 (Max) (new model, index 59.7)https://llm-frontier.catalystneuro.com/advance/2026-07-16/kimi-k32026-07-16T00:00:00ZKimi K3 (Max): now the cheapest way to reach index 59.0 to 59.7 at $0.84 per task, taking it from GPT-5.6 Sol. Open weights.2026-07-09: GPT-5.6 Sol (Max) (new model, index 60.9)https://llm-frontier.catalystneuro.com/advance/2026-07-09/gpt-5-6-sol2026-07-09T00:00:00ZGPT-5.6 Sol (Max): now the cheapest way to reach index 59.0 to 60.9 at $1.23 per task, taking it from Claude Fable 5. New cost record for index ≥ 60. Proprietary.2026-07-09: GPT-5.6 Sol (Xhigh) (new model, index 59.0)https://llm-frontier.catalystneuro.com/advance/2026-07-09/gpt-5-6-sol-xhigh2026-07-09T00:00:00ZGPT-5.6 Sol (Xhigh): now the cheapest way to reach index 57.3 to 59.0 at $0.81 per task, taking it from Claude Fable 5. Proprietary.2026-07-09: GPT-5.6 Sol (High) (new model, index 57.3)https://llm-frontier.catalystneuro.com/advance/2026-07-09/gpt-5-6-sol-high2026-07-09T00:00:00ZGPT-5.6 Sol (High): now the cheapest way to reach index 55.8 to 57.3 at $0.55 per task, taking it from Claude Opus 4.8 and GPT-5.5, both of which left the frontier. Proprietary.2026-07-09: Muse Spark 1.1 (Xhigh) (new model, index 53.2)https://llm-frontier.catalystneuro.com/advance/2026-07-09/muse-spark-1-12026-07-09T00:00:00ZMuse Spark 1.1 (Xhigh): now the cheapest way to reach index 52.3 to 53.2 at $0.29 per task, taking it from Grok 4.5. Proprietary.2026-07-09: GPT-5.6 Luna (Max) (new model, index 52.3)https://llm-frontier.catalystneuro.com/advance/2026-07-09/gpt-5-6-luna2026-07-09T00:00:00ZGPT-5.6 Luna (Max): now the cheapest way to reach index 50.7 to 52.3 at $0.24 per task, taking it from Grok 4.5. Proprietary.2026-07-09: GPT-5.6 Sol (Low) (new model, index 50.7)https://llm-frontier.catalystneuro.com/advance/2026-07-09/gpt-5-6-sol-low2026-07-09T00:00:00ZGPT-5.6 Sol (Low): now the cheapest way to reach index 50.1 to 50.7 at $0.23 per task, taking it from Grok 4.5. Proprietary.2026-07-09: GPT-5.6 Luna (Xhigh) (new model, index 50.1)https://llm-frontier.catalystneuro.com/advance/2026-07-09/gpt-5-6-luna-xhigh2026-07-09T00:00:00ZGPT-5.6 Luna (Xhigh): now the cheapest way to reach index 47.0 to 50.1 at $0.16 per task, taking it from Grok 4.5 and Gemini 3.1 Pro Preview; Gemini 3.1 Pro Preview left the frontier. New cost record for index ≥ 50. Proprietary.2026-07-09: GPT-5.6 Luna (High) (new model, index 47.0)https://llm-frontier.catalystneuro.com/advance/2026-07-09/gpt-5-6-luna-high2026-07-09T00:00:00ZGPT-5.6 Luna (High): now the cheapest way to reach index 45.3 to 47.0 at $0.11 per task, taking it from Gemini 3.1 Pro Preview and MiniMax-M3; MiniMax-M3 left the frontier. Proprietary.2026-07-08: Grok 4.5 (High) (new model, index 55.8)https://llm-frontier.catalystneuro.com/advance/2026-07-08/grok-4-52026-07-08T00:00:00ZGrok 4.5 (High): now the cheapest way to reach index 47.7 to 55.8 at $0.36 per task, taking it from GPT-5.5 and GLM-5.2; GLM-5.2 left the frontier. New cost record for index ≥ 50. Proprietary.2026-06-16: GLM-5.2 (Max) (new model, index 52.6)https://llm-frontier.catalystneuro.com/advance/2026-06-16/glm-5-22026-06-16T00:00:00ZGLM-5.2 (Max): now the cheapest way to reach index 47.7 to 52.6 at $0.44 per task, taking it from GPT-5.5 and Gemini 3.5 Flash; Gemini 3.5 Flash left the frontier. New cost record for index ≥ 50. Open weights.2026-06-09: Claude Fable 5 (Max, Opus 4.8 Fallback) (new model, index 62.1)https://llm-frontier.catalystneuro.com/advance/2026-06-09/claude-fable-52026-06-09T00:00:00ZClaude Fable 5 (Max, Opus 4.8 Fallback): pushed the intelligence ceiling from 57.3 to 62.1, at $3.14 per task. New cost record for index ≥ 60. Proprietary.2026-06-01: MiniMax-M3 (new model, index 45.4)https://llm-frontier.catalystneuro.com/advance/2026-06-01/minimax-m32026-06-01T00:00:00ZMiniMax-M3: now the cheapest way to reach index 45.3 to 45.4 at $0.14 per task, taking it from Gemini 3.1 Pro Preview. Open weights.