Claude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/MClaude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/M
BETA
Subscribe
← Back to Index·All OpenAI models
OpenAI
OpenAIMultimodalAUTO PROFILELIVE INDEX

GPT-5.1-Codex

text+image->text

GPT-5.1-Codex sits in the frontier tier — built for high-capability reasoning, tool use, and long-form output where capability outweighs cost. Available via OpenAI. 400K-token context. Mid-tier pricing.

GPT-5.1-Codex is a multimodal AI model from OpenAI. It costs $1.250 per million input tokens and $10.000 per million output tokens (blended $3.875/M), with a 400K-token context window.

Modalities text, visionProvider pricing ↗API docs ↗Pricing source ↗Compare with another model →Estimate monthly cost →
INPUT
$1.250/M
per million input tokens
OUTPUT
$10.000/M
per million output tokens
BLENDED 70/30
$3.875/M
default reference rate · how it's calculated →
CONTEXT
400K
400,000 tokens
What it's good at
  • Strong general reasoning
  • Tool use & function calling
  • Long-form writing
  • Production-grade reliability
  • Multimodal: handles images alongside text
Typical use cases
  • Production assistants
  • Long-document analysis
  • Multi-step agent workflows
  • Engineering copilots
Benchmarks
No published benchmark scores tracked for this model yet. Frontier and reasoning models from major providers have scores; smaller models and inference-host variants typically inherit the underlying open-weights score.
More from OpenAI
See all 25 →
GPT-5.5
Frontier · 1M ctx
in $5.000/Mout $30.000/M
GPT-5.2
Frontier · 400K ctx
in $1.750/Mout $14.000/M
GPT-5.2-Codex
Coding · 400K ctx
in $1.750/Mout $14.000/M
GPT-5
Frontier · 400K ctx
in $1.250/Mout $10.000/M
GPT-4.1
Frontier · 1M ctx
in $2.000/Mout $8.000/M
GPT-4.1 mini
Efficient · 1M ctx
in $0.400/Mout $1.600/M
Frequently asked questions

How much does GPT-5.1-Codex cost?

GPT-5.1-Codex costs $1.250 per million input tokens and $10.000 per million output tokens, for a blended reference rate of $3.875 per million tokens.

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

GPT-5.1-Codex supports up to 400K tokens of context (400,000 tokens).

What is GPT-5.1-Codex best for?

GPT-5.1-Codex is well suited to Strong general reasoning, Tool use & function calling and Long-form writing.

Who makes GPT-5.1-Codex?

GPT-5.1-Codex is developed and served by OpenAI.