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Poe

GPT-5.3-Codex-Spark API

Poe
About

Build advanced reasoning agents with GPT-5.3-Codex-Spark, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support. Access GPT-5.3-Codex-Spark via the Poe API with up to 16K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
128K

Tokens

Input Limit
128K

Tokens

Max Output
16K

Tokens

Pricing

Standard (per 1M tokens)

Input
Free
Output
Free
Frequently Asked Questions

GPT-5.3-Codex-Spark by Poe costs Free per 1M input tokens and Free per 1M output tokens.

Model Details
ID
openai/gpt-5.3-codex-spark
Provider
Poe
Family
Release Date
Mar 4, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
POE_API_KEY
API Base URL
https://api.poe.com/v1
Documentation