GPT-5.3-Codex
OpenAIUpdated March 2026. GPT-5.3-Codex by OpenAI: $2/M input, $10/M output tokens. 200K context, 33K max output. Function Calling & JSON Mode. Free calculator + compare 40+ models.
Input Price
$2.00
per 1M tokens
Output Price
$10.00
per 1M tokens
Context Window
200K
tokens
Specifications
| Provider | OpenAI |
| Model ID | gpt-5-3-codex |
| Input Price | $2 / 1M tokens |
| Output Price | $10 / 1M tokens |
| Context Window | 200K tokens |
| Max Output | 33K tokens |
| Capabilities | textfunction_callingstructured_output |
| Release Date | 2026-02 |
| Notes | Agentic coding model optimized for code generation and multi-step tasks. 25% faster than GPT-5.2 with 200K context window and 32K max output. Best for autonomous coding workflows. |
Monthly Cost Estimates
Estimated monthly costs based on different daily usage levels (assuming 50% input / 50% output split).
| Daily Tokens | Monthly Cost | Annual Cost |
|---|---|---|
| 10K | $1.80 | $21.60 |
| 50K | $9.00 | $108.00 |
| 100K | $18.00 | $216.00 |
| 500K | $90.00 | $1080.00 |
| 1.0M | $180.00 | $2160.00 |
About GPT-5.3-Codex
GPT-5.3-Codex is a large language model by OpenAI. It features a 200K token context window with up to 33K tokens of output per request. The model supports 3 capabilities: text, function_calling, structured_output.
At $2 per million input tokens and $10 per million output tokens, GPT-5.3-Codex is positioned as a mid-range option in the OpenAI lineup. Use our Token Counter to estimate how many tokens your prompts use, and our Pricing Calculator to compare costs across all models.
GPT-5.3-Codex Key Details
- Pricing: $2/M input tokens, $10/M output tokens
- Context window: 200K tokens — suitable for large documents and codebases
- Max output: 33K tokens per response
- Capabilities: text, function_calling, structured_output
- Highlights: Agentic coding model optimized for code generation and multi-step tasks. 25% faster than GPT-5.2 with 200K context window and 32K max output. Best for autonomous coding workflows.
- Released: 2026-02
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FAQ
How much does GPT-5.3-Codex cost?
GPT-5.3-Codex costs $2 per million input tokens and $10 per million output tokens. For a typical workload of 100K tokens/day, expect approximately $21.00/month.
What is GPT-5.3-Codex's context window?
GPT-5.3-Codex supports a context window of 200K tokens. This means your combined input prompt and output response can be up to 200K tokens. The maximum output per response is 33K tokens.
Is GPT-5.3-Codex good for my use case?
GPT-5.3-Codex supports text, function_calling, structured_output. As a mid-range model, it balances capability and cost for most production use cases. Use our Pricing Calculator to compare with alternatives.