The go-to model for large-codebase engineering tasks, but expensive output costs limit its appeal for high-throughput pipelines.
93
Coding
58
Writing
72
Research
0
Images
52
Value
88
Long Context
Use this when
Professional software engineers who need a high-capacity model for large codebase analysis, complex refactoring, and multi-file code generation.
Skip this if
You need fast, high-volume code completions on a tight budget or require multimodal capabilities like image understanding or generation.
Pricing
$1.25/1M in
$10.00/1M out
→0%since May 2026
Context
400k tokens
Speed
Balanced
Asymmetric pricing ($1.25 input / $10 output) rewards read-heavy workflows like code review and repo analysis over generation-heavy tasks. The 400K context window is among the largest in the balanced price tier. No image input/output support confirmed at launch.
Exceptional multi-file and large codebase understanding across its 400K context window
Stronger code generation accuracy than GPT-4o, particularly in Python, TypeScript, and systems languages
Solid reasoning over complex software architecture and debugging chains
Competitive asymmetric pricing — cheap input cost makes ingesting large repos affordable
Weaknesses
Output cost of $10/1M tokens is steep for high-volume code generation pipelines compared to Claude Sonnet 4.6 or Gemini 3.1 Pro
Not a general-purpose creative or writing model — prose quality lags behind Claude Sonnet 4.6
No native image generation or multimodal output capabilities
Real-world use cases
What people actually use OpenAI: GPT-5.1-Codex for.
Ingesting an entire Node.js monorepo and generating a refactoring plan with dependency impact analysis
Debugging a complex async race condition across 15+ interconnected files in a single prompt
Generating comprehensive unit test suites for legacy Python codebases with full context retention
Price History
OpenAI: GPT-5.1-Codex pricing over time
→0% since May 9
48 data points · tracked daily since May 9, 2026
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Professional software engineers who need a high-capacity model for large codebase analysis, complex refactoring, and multi-file code generation.. Start free — no card required.
Recommendations are made independently based on real-world use and public benchmarks. See our disclosures for details.
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Pricing moves, ranking shifts, and capability updates.
New ModelMar 27, 2026
OpenAI: GPT-5.1-Codex — added to UseRightAI
OpenAI: GPT-5.1-Codex (OpenAI) is now indexed. It supersedes GPT-4o. The go-to model for large-codebase engineering tasks, but expensive output costs limit its appeal for high-throughput pipelines.
OpenAI: GPT-5.1-Codex is best for professional software engineers who need a high-capacity model for large codebase analysis, complex refactoring, and multi-file code generation.. It is a strong fit when that workflow matters more than the tradeoffs around balanced pricing and balanced speed.
When should I avoid OpenAI: GPT-5.1-Codex?
You need fast, high-volume code completions on a tight budget or require multimodal capabilities like image understanding or generation.
What is a cheaper alternative to OpenAI: GPT-5.1-Codex?
Meta: Llama 3.1 8B Instruct is the lower-cost option to compare first when you want a similar workflow fit with less token spend.
What is a faster alternative to OpenAI: GPT-5.1-Codex?
GPT-5.5 is the better pick when response time matters more than maximum depth or premium quality.
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