# GPT-5.3 Codex Spark

> GPT-5.3 Codex Spark is a low-latency, lower-cost variant of GPT-5.3 Codex tuned for fast iterative coding inside the Codex environment, with streaming and function calling. Served through OpenAI's Responses API.


**ID**: `openai/gpt-5.3-codex-spark`  
**Creator**: OpenAI  
**Category**: text  
**Context**: 200K tokens  
**Input**: $0.50/M  
**Output**: $4.00/M  
**Released**: 2026-03-04  
**Web page**: https://anyrouter.dev/model/openai/gpt-5.3-codex-spark

**Input modalities**: text  
**Output modalities**: text  

**Tokenizer**: GPT

**Capabilities**: chat, coding, reasoning, streaming, function-calling

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| opencode-zen-byok | $0.50/M | $4.00/M |

## Benchmarks

- **GPQA Diamond**: 0.7