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  1. Models
  2. Text
  3. OpenAI

GPT 5.3 Codex

Coding-focused GPT-5.3 variant with optimized routing.

  • Reasoning
  • Vision
  • Native PDF input
  • Tool Calling
  • Structured Output

Added Feb 24, 2026

Pricing

Auto routing · per 1M tokens
Input
$1.75
Output
$14.00
Cache read
$0.175
Compare provider prices

Specifications

Context window
400K
Max output
128K

Benchmarks

Leaderboard results

BenchmarkScoreRank on NanoGPT
Epoch AI Benchmarking Hub

Epoch AI data, CC BY 4.0 · Updated Nov 13, 2026

SWE-bench Verified

74.8%

#13 of 28

Filtered and ranked to models on NanoGPT.

Providers

Auto routing is available for this model. Explicit provider selection is not available.

Auto
Auto
Recommended
$1.75$14.00$0.175N/AN/A
Batch API
ProviderInputOutputCached input
OpenAI
OpenAIgpt-5.3-codex
$0.875/M$7.00/MN/A

Reliability

Related text models

Compare GPT 5.3 Codex with similar models from the same provider or model family.

GPT 5.2 Codex

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Coding-focused GPT-5.2 variant with optimized routing.

GPT 5.1 Codex Max

openai/gpt-5.1-codex-max

Top-tier GPT-5.1 Codex route used when direct OpenAI is unavailable.

GPT 5.1 Codex

openai/gpt-5.1-codex

Coding-focused GPT-5.1 variant with optimized routing.

GPT 5.1 Codex Mini

openai/gpt-5.1-codex-mini

Lightweight GPT-5.1 Codex path.

GPT 6.1 Terra Pro

openai/gpt-6.1-terra-pro

GPT-6.1 Terra Pro uses the same underlying model as GPT-6.1 Terra with Pro reasoning mode enabled for higher-quality responses on complex tasks.

GPT 6.1 Terra

openai/gpt-6.1-terra

GPT-6.1 Terra is a fast, efficient model for everyday work, with strong visual reasoning, clearer writing, and capable coding at half GPT-6.1 Sol’s standard token prices. It supports text and image input, tool calling, structured outputs, and optional reasoning from none through max.