OpenAI: GPT-5.1-Codex-Max

Pricing, context window and lifecycle for openai/gpt-5.1-codex-max, tracked from what the vendor publishes.

2026-07-23 - its vendor retired this model on that date, and the catalogue still lists it. Anything still calling it is running on borrowed time.

To find every place that calls it:

curl -sO https://neosignal-ai.vercel.app/check.py
python check.py .

Price per million tokens

Facts

Supported parameters

include_reasoning, max_completion_tokens, reasoning, reasoning_effort, response_format, seed, structured_outputs, tool_choice, tools

Other OpenAI models

• openai/gpt-3.5-turbo $0.500 in / $1.50 out
• openai/gpt-3.5-turbo-0613 $1.00 in / $2.00 out
• openai/gpt-3.5-turbo-16k $3.00 in / $4.00 out
• openai/gpt-3.5-turbo-instruct $1.50 in / $2.00 out
• openai/gpt-3.5-turbo:batch $0.250 in / $0.750 out
• openai/gpt-4 $30.00 in / $60.00 out
• openai/gpt-4-turbo $10.00 in / $30.00 out
• openai/gpt-4-turbo-preview $10.00 in / $30.00 out
• openai/gpt-4-turbo:batch $5.00 in / $15.00 out
• openai/gpt-4.1 $2.00 in / $8.00 out

Change history

Every change we have observed since tracking began.

Check this model and the rest of your stack It opens with this id already filled in. Nothing is stored - the list lives in the link.

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