GPT-5.1-Codex: API pricing, context window and capabilities

Prices from official vendor price lists · October 2026

GPT-5.1-Codex costs $1.25 per 1M input tokens and $10 per 1M output tokens, with a 400K context window. Frontier tier: dearer than 81% of this rating, with GPT-5.4 Mini as the nearest cheaper OpenAI option. Recorded for vision, coding, reasoning.

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Capabilities

API $/1M (in / out)

$1.25 / $10

Context window

400K tokens

Price / mo

API only

Overview Reviews

GPT-5.1-Codex is an AI model from OpenAI, priced at $1.25 input and $10 output per 1M tokens. That places it in the frontier tier of this rating — dearer than 81% of the 205 priced models listed.

It holds 400K tokens in a single conversation. Capabilities recorded in this rating: text & chat, vision, coding, reasoning, tool calling. Access is through the API rather than a consumer subscription.

API price$1.25 / $10per 1M tokens, in / out

Context400K tokenstokens per conversation

VendorOpenAIall models from this vendor

TierFrontierdearer than 81% of models

Cost calculator

1M tokens/mo10M tokens/mo50M tokens/mo200M tokens/mo

Standard$7.81~~AED 29 per month~~

With batch −50%$3.91~~AED 14 per month~~

With caching on input$7.53~~AED 28 per month~~

Standard$78.13~~AED 287 per month~~

With batch −50%$39.06~~AED 143 per month~~

With caching on input$75.31~~AED 277 per month~~

Standard$391~~AED 1,435 per month~~

With batch −50%$195~~AED 717 per month~~

With caching on input$377~~AED 1,383 per month~~

Standard$1,563~~AED 5,738 per month~~

With batch −50%$781~~AED 2,869 per month~~

With caching on input$1,506~~AED 5,532 per month~~

Assumes a 1:3 input-to-output ratio, which is typical for chat and generation. Dirham figures use 3.6725 per dollar. Batch and caching discounts apply where the vendor offers them.

Compared with alternatives

How GPT-5.1-Codex sits against its neighbours in this rating. Tap a card to open that model.

Good and poor fit

Good fit

Multi-step analysis, planning and code review, where the first plausible answer is often wrong.
Writing, reviewing and refactoring code, including fill-in-the-middle edits.
Reading screenshots, charts, scanned documents and photos.

Poor fit

Classification, routing and short summaries — a small model does these identically for a fraction of the price.

Related filters

Text & chat234 models for text generation and chat

Vision159 models that read images

Coding17 models built for writing code

Reasoning175 models that think before answering

Tool calling172 models that call your functions

OpenAI30 models from this vendor

All 245 modelsThe full rating with filters and prices

Frequently asked questions

How much does GPT-5.1-Codex cost?

$1.25 / $10 per 1M tokens, input and output. In dirhams that is roughly AED 4.59 per 1M input tokens. Batch processing halves it where the vendor offers it.

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

400K tokens in a single conversation.

What can GPT-5.1-Codex do?

In this rating it is recorded with: text & chat, vision, coding, reasoning, tool calling, structured JSON output, code execution, prompt caching, batch API, priority / fast tier, multilingual, proprietary API.

Is GPT-5.1-Codex a good choice?

It depends on the job. See the good-fit and poor-fit lists above, and compare against the neighbouring models before committing.

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