Codex Models by OpenAI
OpenAIProprietary
5 models2021–2026Up to 400k ctxFrom $1.75/1M input
Last refreshed 2026-06-10. Next refresh: weekly.
Details
ResearcherOpenAI
LicenseProprietary
Commercial useCommercial use: conditional
Models5
Released2021–2026
Max context400k
Capabilities
Vision1 of 5 models
Reasoning1 of 5 models
JSON / Tool use1 of 5 models
Structured Outputs1 of 5 models
Code Execution1 of 5 models
Links
WebsiteAbout
OpenAI coding models optimized for agentic software engineering in Codex and similar developer environments, including GPT-5.3-Codex.
Decision facts
- Best fit
- codevision and multimodal workreasoning
- Capability starting point
- GPT-5.3-Codex with 400k context and reasoning, JSON / Tool use, structured outputs, and multimodal inputs
- Lowest tracked input
- GPT-5.3-Codex · $1.75/1M · OpenRouter
- Closest related family
- GPT-5
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
1 in view4 retired
GPT-5.3-CodexCurrent
Use when the workload needs code, 400k context, and reasoning.
2026-02code400k contextreasoning
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| GPT-5.3-Codex | Use when the workload needs code, 400k context, and reasoning. | 2026-02 | code400k contextreasoning | Current |
Release Timeline
4 release groups2026-02
1 current
GPT-5.3-Codex
Currentcode400k contextreasoning
2021-11
2 retired
Code Cushman 001
Archivedcode
Code Cushman 002
Archivedcode
2021-08
1 retired
Code Davinci 002
Archivedcode
2021-07
1 retired
Code Davinci 001
Archivedcode
Specifications(5 models)
| Model | Released | Context | Vision | Reasoning | JSON / Tool use | Structured Outputs | Code Exec |
|---|---|---|---|---|---|---|---|
| GPT-5.3-Codex | 2026-02 | 400k | Yes | Yes | Yes | Yes | Yes |
Available From(3 providers)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| GPT-5.3-Codex | OpenRouter | $1.75 | $14 | Serverless |
| GPT-5.3-Codex | OpenAI API | $1.75 | $14 | Serverless |
| GPT-5.3-Codex | Vercel AI Gateway | $1.75 | $14 | Serverless |
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