openai

OpenAI: GPT-5.1-Codex

The OpenAI model supports both text and image inputs, allowing it to handle various data formats. It also features a high context length of 400,000 tokens, enabling in-depth processing of complex information. The model is equipped with tools for reasoning and supporting structured output, although the latter is not specified. Considering its pricing and performance, this model may be suitable for those who require robust image-text processing capabilities at a cost of $1.25 per million input tokens and $10.00 per million output tokens. Its blended benchmark score of 58.0 suggests it holds its own against other models in independent evaluations, making it worth shortlisting for applications where high context handling is essential.

Quality Score
99/100
price + capability + benchmarks
Input Price
$1.25
per 1M tokens · checked 2026-09-04
Output Price
$10.00
per 1M tokens · checked 2026-09-04
Context Window
400,000
tokens

Benchmark results

Independent, published benchmarks. Blended score 58.0 across 1 benchmark, last refreshed 2026-09-04. How scoring works →

BenchmarkMeasuresScore
AI Index broad capability composite 58.7
Model ID
openai/gpt-5.1-codex
Vendor
openai
Released
November 2025
Tokenizer
GPT
Input Modalities
text, image
Output Modalities
text
Max Output
128,000 tokens
Tool Calling
✓ supported
Structured Output
✓ supported
Reasoning Mode
✓ supported
Vision
✓ accepts images
Audio
no
Moderated
no

What it costs in practice

Computed from the current $1.25/M input and $10.00/M output rates. Run your own numbers →

JobTokensCost
Summarize a 50-page report 30k in / 1.5k out $0.05
Classify 1,000 customer emails 500k in / 50k out $1.12
A month of a busy support chatbot 5M in / 2M out $26.25

Similar models

Quick answers

How much does OpenAI: GPT-5.1-Codex cost?
$1.25 per million input tokens and $10.00 per million output tokens.
What is OpenAI: GPT-5.1-Codex's context window?
400,000 tokens, roughly 600 pages of text in a single request.
Does OpenAI: GPT-5.1-Codex support tool calling?
It supports tool calling, structured output, a reasoning mode.
Can OpenAI: GPT-5.1-Codex process images?
Yes, it accepts image input.