Models · OpenAI

GPT-5.5 Codex

Only from the makerNot on OpenRouterAvailable nowGenerally availableClosed (can't be downloaded)Proprietary

GPT-5.5 Codex is made by OpenAI. We don't have enough test results yet to rank it.

Seen on Vals.ai SkillsBench (Codex harness); not on OpenRouter.

Writing & creativity: —
Research & analysis: —
Coding: —
Price: Price unknown— / —
Price per 1M (blended)Blended / 1M: —
MemoryContext: —
Longest answerMax output: —
Test resultsResults: 1 (1 independent1 indep.)
Out sinceReleased: —
Made byVendor: OpenAI
UnderstandsInputs: —

Scores are out of 100 for each area, compared with every model we track; “#” is its rank. Context is how much text it can read at once (1M is roughly 700,000 words). Blended price mixes the cost of what you send and what it writes back.

Thinking levels

Reasoning settings

You can't choose how long this one thinks.

No adjustable reasoning setting listed.

Links

OpenAI's model listOpenAI docs ↗

Every test result

Every result

All the numbers,with where they came from.

Every result we've found for this model, with who measured it and a link to where we read it.

All raw rows (vendor and independent kept separate), with setting label, source, date, harness and notes.

All results for this model
						NotesNotes
SkillsBench	62.5%	Default	Independent testIndependentVals.ai ↗	27 Sep 2026	Codex	±4.412 stderr; $1.573/test