Get Started with GPT-5.3-Codex on OpenRouter
OpenRouter offers access to GPT-5.3-Codex. Multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.75 |
| Output tokens | $14.00 |
Capabilities
VisionMultimodalReasoningFunction CallingTool UseStructured OutputsCode Execution
About GPT-5.3-Codex
GPT-5.3-Codex is OpenAI's most capable agentic coding model as of February 2026, combining the Codex and GPT-5 training stacks for advanced code generation, reasoning, and general intelligence. Approximately 25% faster than its predecessors and optimized for steerable coding agents. Predecessor to GPT-5.4. No public parameter count or context window disclosed.
Model Specs
Released2026-02-05
ArchitectureDecoder Only