Last refreshed 2026-06-15. Next refresh: weekly.
Why use GPT-5.3-Codex on OpenRouter?
OpenRouter offers GPT-5.3-Codex with pay-as-you-go pricing at $1.75/1M input tokens. OpenRouter is a multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.
Compare GPT-5.3-Codex across 3 providers to find the best fit for your use caseInput / 1M
$1.75
Output / 1M
$14.00
Cache
Not sourced
Batch
Not sourced
Setup recipe
Docs fallbackInstall
Use the provider REST API or SDKAuth
Create a provider API keyCall
model: openai/gpt-5.3-codexModel ID
openai/gpt-5.3-codexRequest example
Curated snippets for this provider are not sourced yet. Use OpenRouter documentation with model ID
openai/gpt-5.3-codex.Gotchas
- Use provider model ID "openai/gpt-5.3-codex", not the LLMReference slug "gpt-5.3-codex".
Compare GPT-5.3-Codex Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| OpenRouter | $1.75 | $14.00 |
| OpenAI API | $1.75 | $14.00 |
| Vercel AI Gateway | $1.75 | $14.00 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.75 |
| Output tokens | $14.00 |
Capabilities
VisionReasoningJSON / Tool useStructured OutputsCode ExecutionPrompt CachingBatch API
About GPT-5.3-Codex
Most capable agentic coding model from OpenAI. Optimized for long-horizon, agentic coding tasks in the Codex CLI and API. Note: GPT-5.3-Codex-Spark is a distinct ChatGPT Pro research preview (not API-accessible).
Get Started
Model Specs
Released2026-02-05
Context400k
ArchitectureDecoder Only
Knowledge cutoff2025-08