Benchmarks
independent evaluations · source: Artificial Analysis| Benchmark | Best score | Effort | Cost / task | |
|---|---|---|---|---|
| CritPt | 5% | default | — | |
| GPQA Diamond | 84% | default | — | |
| Humanity's Last Exam | 28% | default | — | |
| IFBench | 74% | default | — | |
| LiveCodeBench | 84% | default | — | |
| Long-Context Reasoning | 72% | default | — | |
| MMLU-ProFrozen Aug 18, 2026 | 86% | default | — | |
| MMMU-Pro | 74% | default | — | |
| Omniscience | -7.5 | default | — | |
| Omniscience Accuracy | 0.4 | default | — | |
| Omniscience Non Hallucination | 0.2 | default | — | |
| SciCodeArtificial Analysis did not report this score in its latest run on Oct 14, 2026 | 41% | — | — | |
| TerminalBench Hard | 38% | default | — | |
| τ²-bench | 87% | default | — |
Pricing by serving provider
standard tier · per 1M tokens · click a provider to expandInput pricing runs from $1.25 to $1.38 per 1M tokens across 3 providers, so the dearest route costs 10% more than the cheapest for the same model.
| Serving provider | Input /1M | Output /1M | Endpoints | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OpenRouterRouted quote | $1.25 | $10.00 | 1 | ||||||||||||||||
Standardopenai/gpt-5-codex
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| VercelRouted quoteVercel reseller quote | $1.25 | $10.00 | 1 | ||||||||||||||||
Standardopenai/gpt-5-codex
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| Azure | $1.38 | $11.00 | 1 | ||||||||||||||||
Standardazure/eu/gpt-5-codex
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| OpenRouter (batch) | $0.625 | $5.00 | 1 | ||||||||||||||||
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Price history
OpenRouter routed quoteOpenRouter's price is a routed quote. It moves with whichever upstream route OpenRouter prefers that day, so we do not track it as a price history.
Cost calculator
estimate your monthly spend on this modelModel IDs
copy the exact identifier for your platformFrequently asked questions
GPT 5 Codex pricing, context and availabilityIs GPT 5 Codex still available?
Yes. GPT 5 Codex is scheduled for retirement on 2027-03-17.
How much does GPT 5 Codex cost?
GPT 5 Codex costs $1.25 per 1M input tokens as an OpenRouter routed quote, and $10.00 per 1M output tokens as an OpenRouter routed quote. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day. Across 3 serving providers, input prices range from $1.25 to $1.38 per 1M tokens.
What is the context window of GPT 5 Codex?
GPT 5 Codex accepts up to 272K tokens of context and can return up to 128K output tokens.
Which providers serve GPT 5 Codex?
GPT 5 Codex is available from 3 serving providers, each with its own pricing and model ID. OpenRouter is currently the cheapest, as a routed quote.
What can GPT 5 Codex do?
GPT 5 Codex supports tool use and reasoning.
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