Model comparison
GPT-5.3-Codex vs GPT-5
Capability radar, value bars, and side-by-side posture.
GPT-5.3-Codex
Not scored
value score
GPT-5
94
value score
GPT-5.3-Codex ctx
—
GPT-5 ctx
400K
Capability radar
Value · context · multimodal · openness · speed posture
Value head-to-head
- GPT-594
Attribute tape
| Field | GPT-5.3-Codex | GPT-5 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context | — | 400K |
| Modalities | Text, Code, Image, Audio | |
| Openness | — | Proprietary Model |
| Speed | — | Fast |
| Price | — | Mid-High |
| Value score | — | 94 |
| 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. | OpenAI frontier multimodal model. |