Model comparison
GPT-5.3-Codex vs GPT-4o
Capability radar, value bars, and side-by-side posture.
GPT-5.3-Codex
Not scored
value score
GPT-4o
87
value score
GPT-5.3-Codex ctx
—
GPT-4o ctx
128K
Capability radar
Value · context · multimodal · openness · speed posture
Value head-to-head
- GPT-4o87
Attribute tape
| Field | GPT-5.3-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-5.3-Codex is OpenAI's flagship agentic coding model, designed for long-horizon software engineering tasks including multi-step code generation, debugging, repository work, and tool-using agent workflows. OpenAI describes it as 25% faster than its predecessor and its most capable agentic coding model to date, with benchmark leadership claims on SWE-Bench Pro and Terminal-Bench. | Omni multimodal GPT widely deployed in products. |