GPT-5.3 Codex
Built by OpenAI · United States · openai.com
Coding-specialized (Codex)
How to use
Just add the suffix. Hard questions still come back from this model; only easy ones drop to something cheaper, and nothing pricier than it gets used.
model: "openai/gpt-5.3-codex:auto"
Sets no behavior — whatever your key already stores stays in effect.
Without the suffix, the bare name always goes to this model — no routing, so nothing saved.
Context
Max output
Input $/1M
Output $/1M
Features
Providers
Providers
Price, latency, and uptime per provider serving this model. Warp tries them in order of how each host has just been behaving, moving to the next on failure. Click a row for regions and data policies.
Loading provider metrics…
Performance
Benchmark quality scores, and measured speed per provider.
Quality
At each model's best reasoning effort
Source: LMArena
Speed
Loading provider metrics…
Parameter support
What Warp actually does with each parameter when you call this model. The answer differs by serving provider and by API surface.