OpenAI: GPT-5.1-Codex-Max
openai/gpt-5.1-codex-max
ReasoningToolsJSONVision
Intelligence
—
Design Elo
—
Speed
—
tokens/sec
Latency
—
first token
Input price
$1.25
245th cheapest
Context
400K
128K max out
How it compares
Cheaper than27%
of all ranked models
Overview
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
Providers & pricing (3)
| Provider | In $/M | Out $/M | Context | Uptime |
|---|---|---|---|---|
| OpenAIcache | $1.25 | $10.00 | 400K | — |
| OpenAIcache | $2.50 | $20.00 | 400K | — |
| Azurecache | $1.25 | $10.00 | 400K | — |
Specifications
Context window400K
Max output128K
Knowledge cutoff—
Input modalitiestext, image
Output modalitiestext
Prompt cachingSupported
Cache read price$0.125/M
ModeratedNo
GPT-5.1-Codex-Max FAQ
How much does GPT-5.1-Codex-Max cost?
GPT-5.1-Codex-Max costs $1.25 per million input tokens and $10.00 per million output tokens via OpenRouter, making it 245th cheapest of 335 paid models.
What is GPT-5.1-Codex-Max's context window?
GPT-5.1-Codex-Max supports a 400K-token context window and can output up to 128K tokens. It accepts text, image input.
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