Gpt-codexClosed Weights

gpt-5.1-codex-max

Best Input Price

$1.13 / 1M

Coding-optimized GPT model for repository edits, reviews, and agentic software work

Context Window

400,000 tokens

Reasoning

Supported

Tool Calling

Supported

Released

2026-01

Inference Providers (3)

Provider	Model ID	Context	Input / 1M	Output / 1M	Action
Jiekou.AI	gpt-5.1-codex-max	400,000	$1.13	$9.00	Docs ↗
OpenCode Zen	gpt-5.1-codex-max	400,000	$1.25	$10.00	Docs ↗
Vivgrid	gpt-5.1-codex-max	400,000	$1.25	$10.00	Docs ↗