Model comparison
GPT-5.1-Codex vs GPT-4o
Capability radar, value bars, and side-by-side posture.
GPT-5.1-Codex
Not scored
value score
GPT-4o
87
value score
GPT-5.1-Codex ctx
—
GPT-4o ctx
128K
Capability radar
Value · context · multimodal · openness · speed posture
Value head-to-head
- GPT-4o87
Attribute tape
| Field | GPT-5.1-Codex | GPT-4o |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context | — | 128K |
| Modalities | Text, Code, Image, Audio | |
| Openness | — | Proprietary Model |
| Speed | — | — |
| Price | — | $2.5/1M in · $10/1M out |
| Value score | — | 87 |
| Summary | GPT-5.1-Codex is OpenAI's agentic coding model, optimized for long-running software engineering tasks such as feature development, refactoring, debugging, and code review in Codex-like environments. It is distinct from GPT-5.1 in being purpose-built for developer workflows rather than general-purpose conversation. | Omni multimodal GPT widely deployed in products. |