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  1. Models
  2. Text
  3. OpenAI

GPT 5.1 Codex

Coding-focused GPT-5.1 variant with optimized routing.

  • Reasoning
  • Vision

Added Nov 13, 2025

Pricing

Auto routing · per 1M tokens
Input
$1.25
Output
$10.00
Cache read
$0.125
Compare provider prices

Specifications

Context window
400K
Max output
128K

Benchmarks

No public benchmark scores for this model yet.

Providers

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

Auto
Auto
Recommended
$1.25$10.00$0.125N/AN/A
Batch API
ProviderInputOutputCached input
OpenAI
OpenAIgpt-5.1-codex
$0.625/M$5.00/MN/A

Reliability

Related text models

Compare GPT 5.1 Codex with similar models from the same provider or model family.

GPT 5.3 Codex

openai/gpt-5.3-codex

Coding-focused GPT-5.3 variant with optimized routing.

GPT 5.2 Codex

openai/gpt-5.2-codex

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 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.