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GPT-5.1-Codex-Max Deprecated

OpenAI Language models Dec 4, 2025

GPT-5.1-Codex-Max is a model from OpenAI, listed under Language models. It was released on Dec 4, 2025. It accepts up to 400k tokens per request.

This model is scheduled for retirement. Plan a migration.

Add to favourites Documentation Official pricing
Headline price
No data
Context window
400k tokens
Max output
128k
Knowledge cutoff
Sep 2024

Current prices

No public API price
This model is distributed as open weights. Running cost depends on your own hardware.

Price history

No price change recorded for this model yet.

How it compares

Context windowTokens per request. Further right holds more. Logarithmic scale: each step is ten times the last.
10k30k100k300k1MGPT-6 Astra: 1.05MGPT-6.1 Sol: 1.05MGPT-6 Luna: 1.05MGPT-6 Sol: 1.05MGPT-5.6 Sol: 1.05MGPT-5.6 Terra: 1.05MGPT-5.6 Luna: 1.05MGPT-6 Astra Pro: 1.05MGPT-6 Luna Pro: 1.05MGPT-6 Sol Pro: 1.05MGPT-6.1 Sol Pro: 1.05MGPT-6.1 Terra: 1.05MGPT-6.1 Terra Pro: 1.05MGPT-5.4: 1.05MGPT-5.4 Pro: 1.05MGPT-5.5: 1.05MGPT-5.5 Pro: 1.05MGemini 4 Argon: 1.05MGemini 3.8 Flash: 1.05MGemini Omni Flash: 1.05MMuse Wonder: 1.05MGemini 3.5 Flash-Lite: 1.05MGemini 3.7 Flash: 1.05MDeepSeek V4 Flash 0731: 1.05MMuse Spark 1.3: 1.05MKimi K3.1 Pro: 1.05MQwen3.8 2.4T A95B: 1.05MGemini 3.1 Pro: 1.05MDeepSeek V4 Flash Vision Exp: 1.05MGemini 3.6 Flash: 1.05MGemini 3.1 Flash-Lite: 1.05MGemini 3 Flash: 1.05MGemini 2.5 Pro: 1.05MGemini 2.5 Flash: 1.05MGemini 2.5 Flash-Lite: 1.05MMuse Spark 1.1: 1.05MMuse Spark 1.2: 1.05MGPT-4.1: 1.05MGPT-4.1 Mini: 1.05MGPT-4.1 nano: 1.05MClaude Fable 5.1: 1MClaude Opus 5.5: 1MClaude Sonnet 5.5: 1MClaude Haiku 5.5: 1MGrok 4.3: 1MDeepSeek V4 Pro: 1MDeepSeek V4.1 Flash: 1MKimi K3: 1MClaude Mythos 5.1: 1MGrok 4.20 Reasoning: 1MGrok 4.20 Non-Reasoning: 1MGrok 4.20 Multi-Agent: 1MZ.ai GLM 5.3 (on Mistral): 1MQwen3.8 27B: 1MQwen3.8 Max Prime: 1MMistral Large 4: 1MClaude Fable 5: 1MClaude Mythos 5: 1MClaude Opus 5: 1MClaude Sonnet 5: 1MClaude Opus 4.8: 1MClaude Opus 4.7: 1MClaude Opus 4.6: 1MClaude Sonnet 4.6: 1MGrok 4.7: 500kGrok 4.6: 500kGrok 4.5: 500kGPT-5.6 Cyber: 400kChat Latest: 400kGPT-5: 400kGPT-5 Mini: 400kGPT-5 nano: 400kGPT-5 Pro: 400kGPT-5.2: 400kGPT-5.2 Pro: 400kGPT-5.4 Mini: 400kGPT-5-Codex: 400kGPT-5.1: 400kGPT-5.1-Codex: 400kGPT-5.1-Codex Mini: 400kGPT-5.2-Codex: 400kGPT-5.3-Codex: 400kGPT-5.4 nano: 400kGrok Build 0.1: 256kMistral Medium 3.5: 256kMistral Small 4: 256kMinistral 3 14B: 256kMinistral 3 8B: 256kMinistral 3 3B: 256kCommand A: 256kCommand A Reasoning: 256kNorth Mini Code: 256kKimi K2.7 Code: 256kMistral Large 3: 256kKimi K2.6: 256kClaude Opus 4.5: 200kClaude Haiku 4.5: 200ko3: 200ko3-pro: 200kClaude Sonnet 4.5: 200kcodex-mini-latest: 200ko1: 200ko1-pro: 200ko3-deep-research: 200ko3-mini: 200ko4-mini: 200ko4-mini-deep-research: 200kgpt-oss-120b: 131kgpt-oss-20b: 131kCommand A+: 128kCodestral: 128kAya Expanse 32B: 128kCommand A Vision: 128kCommand R7B: 128kCommand R (08-2024): 128kCommand R+ (08-2024): 128kChatGPT-4o: 128kGPT-4 Turbo: 128kGPT-4 Turbo Preview: 128kGPT-4.5 Preview: 128kGPT-4o: 128kGPT-4o Mini: 128kGPT-4o Mini Search Preview: 128kGPT-4o Search Preview: 128kGPT-5 Chat: 128kGPT-5.1 Chat: 128kGPT-5.2 Chat: 128kGPT-5.3 Chat: 128ko1 Preview: 128ko1-mini: 128kCommand R: 128kCommand R+: 128kVoxtral Small: 32kGPT-3.5 Turbo: 16kbabbage-002: 16kdavinci-002: 16kAya Vision 32B: 16kcomputer-use-preview: 8kGPT-4: 8kTiny Aya Earth: 8kTiny Aya Global: 8kGPT-5.1-Codex-Max: 400k400k
Show data
ModelValue
GPT-6 Astra1.05M
GPT-6.1 Sol1.05M
GPT-6 Luna1.05M
GPT-6 Sol1.05M
GPT-5.6 Sol1.05M
GPT-5.6 Terra1.05M
GPT-5.6 Luna1.05M
GPT-6 Astra Pro1.05M
GPT-6 Luna Pro1.05M
GPT-6 Sol Pro1.05M
GPT-6.1 Sol Pro1.05M
GPT-6.1 Terra1.05M
GPT-6.1 Terra Pro1.05M
GPT-5.41.05M
GPT-5.4 Pro1.05M
GPT-5.51.05M
GPT-5.5 Pro1.05M
Gemini 4 Argon1.05M
Gemini 3.8 Flash1.05M
Gemini Omni Flash1.05M
Muse Wonder1.05M
Gemini 3.5 Flash-Lite1.05M
Gemini 3.7 Flash1.05M
DeepSeek V4 Flash 07311.05M
Muse Spark 1.31.05M
Kimi K3.1 Pro1.05M
Qwen3.8 2.4T A95B1.05M
Gemini 3.1 Pro1.05M
DeepSeek V4 Flash Vision Exp1.05M
Gemini 3.6 Flash1.05M
Gemini 3.1 Flash-Lite1.05M
Gemini 3 Flash1.05M
Gemini 2.5 Pro1.05M
Gemini 2.5 Flash1.05M
Gemini 2.5 Flash-Lite1.05M
Muse Spark 1.11.05M
Muse Spark 1.21.05M
GPT-4.11.05M
GPT-4.1 Mini1.05M
GPT-4.1 nano1.05M
Claude Fable 5.11M
Claude Opus 5.51M
Claude Sonnet 5.51M
Claude Haiku 5.51M
Grok 4.31M
DeepSeek V4 Pro1M
DeepSeek V4.1 Flash1M
Kimi K31M
Claude Mythos 5.11M
Grok 4.20 Reasoning1M
Grok 4.20 Non-Reasoning1M
Grok 4.20 Multi-Agent1M
Z.ai GLM 5.3 (on Mistral)1M
Qwen3.8 27B1M
Qwen3.8 Max Prime1M
Mistral Large 41M
Claude Fable 51M
Claude Mythos 51M
Claude Opus 51M
Claude Sonnet 51M
Claude Opus 4.81M
Claude Opus 4.71M
Claude Opus 4.61M
Claude Sonnet 4.61M
Grok 4.7500k
Grok 4.6500k
Grok 4.5500k
GPT-5.6 Cyber400k
Chat Latest400k
GPT-5400k
GPT-5 Mini400k
GPT-5 nano400k
GPT-5 Pro400k
GPT-5.2400k
GPT-5.2 Pro400k
GPT-5.4 Mini400k
GPT-5-Codex400k
GPT-5.1400k
GPT-5.1-Codex400k
GPT-5.1-Codex Mini400k
GPT-5.2-Codex400k
GPT-5.3-Codex400k
GPT-5.4 nano400k
Grok Build 0.1256k
Mistral Medium 3.5256k
Mistral Small 4256k
Ministral 3 14B256k
Ministral 3 8B256k
Ministral 3 3B256k
Command A256k
Command A Reasoning256k
North Mini Code256k
Kimi K2.7 Code256k
Mistral Large 3256k
Kimi K2.6256k
Claude Opus 4.5200k
Claude Haiku 4.5200k
o3200k
o3-pro200k
Claude Sonnet 4.5200k
codex-mini-latest200k
o1200k
o1-pro200k
o3-deep-research200k
o3-mini200k
o4-mini200k
o4-mini-deep-research200k
gpt-oss-120b131k
gpt-oss-20b131k
Command A+128k
Codestral128k
Aya Expanse 32B128k
Command A Vision128k
Command R7B128k
Command R (08-2024)128k
Command R+ (08-2024)128k
ChatGPT-4o128k
GPT-4 Turbo128k
GPT-4 Turbo Preview128k
GPT-4.5 Preview128k
GPT-4o128k
GPT-4o Mini128k
GPT-4o Mini Search Preview128k
GPT-4o Search Preview128k
GPT-5 Chat128k
GPT-5.1 Chat128k
GPT-5.2 Chat128k
GPT-5.3 Chat128k
o1 Preview128k
o1-mini128k
Command R128k
Command R+128k
Voxtral Small32k
GPT-3.5 Turbo16k
babbage-00216k
davinci-00216k
Aya Vision 32B16k
computer-use-preview8k
GPT-48k
Tiny Aya Earth8k
Tiny Aya Global8k
GPT-5.1-Codex-Max400k

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1
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Frequently asked questions

What is the context window of GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max accepts up to 400k tokens per request. It can write up to 128k tokens in one response.

Is GPT-5.1-Codex-Max still available?

It still works, but it is deprecated: OpenAI plans to retire it.

When was GPT-5.1-Codex-Max released?

GPT-5.1-Codex-Max was released in Dec 4, 2025.

What is the API model ID for GPT-5.1-Codex-Max?

Use gpt-5.1-codex-max when calling the OpenAI API.

What are the alternatives to GPT-5.1-Codex-Max?

Models in the same category at a similar price include Ministral 3 14B (Mistral AI), Ministral 3 8B (Mistral AI), Ministral 3 3B (Mistral AI) and Gemini 3.1 Pro (Google).