What is GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max is a large language model from OpenAI, released on November 19, 2025. It accepts text and image input.

When was GPT-5.1-Codex-Max released?

OpenAI released GPT-5.1-Codex-Max on November 19, 2025.

How much does GPT-5.1-Codex-Max cost?

GPT-5.1-Codex-Max costs $1.25 per 1M input tokens and $10 per 1M output tokens through the OpenAI API. Cached input costs $0.125 per 1M tokens. Prices are from OpenAI's official pricing as of October 5, 2026.

What is GPT-5.1-Codex-Max's context window?

GPT-5.1-Codex-Max has a 400K-token context window and can generate up to 128K output tokens.

How does GPT-5.1-Codex-Max score on benchmarks?

GPT-5.1-Codex-Max has 3 cited benchmark scores, including SWE-bench Verified 77.9%, SWE-Lancer IC SWE 79.9% and Terminal-Bench 2.0 58.1%. Each score links to its source.

GPT-5.1-Codex-Max

OpenAI·Degraded·Released 2025-11-19textvision

Context400k

Max output128k

Input / 1M$1.25 ↗

Output / 1M$10 ↗

Cached in$0.125

Benchmarks3

Benchmarks

Cited public sources · rank is exact-benchmark, apples-to-apples

SWE-bench Verified

#12/5977.9% ↗

SWE-Lancer IC SWE

#1/279.9% ↗

Terminal-Bench 2.0

#10/2058.1% ↗

Compare

vs Gemini 4 Argon vs GPT-6.1 Sol vs Claude Sonnet 5.5 vs Muse Spark 1.3 vs GPT-6 Sol vs GPT-6 Luna vs Claude Opus 5.5 vs GPT-6 Astra

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GPT-5.1-Codex-Max FAQ

What is GPT-5.1-Codex-Max?: GPT-5.1-Codex-Max is a large language model from OpenAI, released on November 19, 2025. It accepts text and image input.
When was GPT-5.1-Codex-Max released?: OpenAI released GPT-5.1-Codex-Max on November 19, 2025.
How much does GPT-5.1-Codex-Max cost?: GPT-5.1-Codex-Max costs $1.25 per 1M input tokens and $10 per 1M output tokens through the OpenAI API. Cached input costs $0.125 per 1M tokens. Prices are from OpenAI's official pricing as of October 5, 2026.
What is GPT-5.1-Codex-Max's context window?: GPT-5.1-Codex-Max has a 400K-token context window and can generate up to 128K output tokens.
How does GPT-5.1-Codex-Max score on benchmarks?: GPT-5.1-Codex-Max has 3 cited benchmark scores, including SWE-bench Verified 77.9%, SWE-Lancer IC SWE 79.9% and Terminal-Bench 2.0 58.1%. Each score links to its source.

Access GPT-5.1-Codex-Max and every other model through one endpoint with automatic failover: Respan gateway.