A serious coding model with repository-scale context that earns its place in any developer's toolkit.
93
Coding
52
Writing
68
Research
0
Images
58
Value
88
Long Context
Use this when
Professional developers who need to reason across large codebases, generate production-ready code, and debug complex multi-file projects.
Skip this if
You need image generation, creative writing, or general-purpose chat — there are better-value models for non-coding tasks.
Pricing
$0.63/1M in
$5.00/1M out
↓50%since May 2026
Context
400k tokens
Speed
Balanced
The $10/1M output cost means heavy code generation workloads can get expensive fast — budget carefully for bulk generation use cases. Context window of 400K is among the largest in its price tier. Supersedes GPT-4o, so existing GPT-4o coding workflows should consider migrating for improved performance.
400K context window enables ingesting entire repositories or large monorepos in a single prompt
Coding-optimized architecture outperforms standard GPT-5 on code generation and refactoring benchmarks
Competitive $1.25/1M input pricing makes large-context coding tasks cost-effective compared to Claude Sonnet 4.6
Strong multi-language support across Python, TypeScript, Rust, Go, and systems-level languages
Weaknesses
Output cost of $10/1M tokens adds up quickly for verbose code generation or documentation tasks
Not a general-purpose reasoning model — creative writing, nuanced analysis, and image tasks are outside its sweet spot
No native image generation or multimodal output capabilities
Real-world use cases
What people actually use OpenAI: GPT-5 Codex for.
Loading an entire Node.js monorepo into context and asking for a cross-cutting refactor to a new authentication pattern
Debugging a complex multi-file Rust application by ingesting all source files and error logs simultaneously
Generating comprehensive unit test suites for a large Python Django application with full codebase context
Price History
OpenAI: GPT-5 Codex pricing over time
↓50% since May 9
88 data points · tracked daily since May 9, 2026
Ready to try it?
Start using OpenAI: GPT-5 Codex
Professional developers who need to reason across large codebases, generate production-ready code, and debug complex multi-file projects.. Start free — no card required.
OpenAI's latest agentic flagship for coding, research, computer-use workflows, and long multi-step knowledge work.
Verdict
Best OpenAI flagship for agentic coding, research, and computer-use work.
Quality score
94%
Pricing
$2.50/1M in
$15.00/1M out
Speed
Balanced
Best for agentic coding, computer-use workflows, and complex research tasks
Context
1M tokens
Ranked from public benchmark and pricing data verified April 26, 2026: SWE-Bench Pro 58.6%, Terminal-Bench 2.0 82.7%, $5/$30 per 1M tokens, 1M API context.
AgenticCodingComputer useLong contextPremium
Best for
Agentic coding, computer-use workflows, and complex research tasks
The flagship of OpenAI's GPT-5.6 family — its most capable reasoning and agentic-coding model, with an 'ultra' mode that spawns sub-agents for long autonomous workflows.
Verdict
Best OpenAI flagship — leads terminal coding and agentic browsing.
Quality score
96%
Pricing
$2.50/1M in
$15.00/1M out
Speed
Deliberate
Best for frontier agentic coding, deep research, and hardest reasoning tasks
Context
1.1M tokens
First frontier model family to clear a customer-by-customer US government review: limited preview June 26, full public release July 9, 2026. Pricing $5/$30 ($10/$45 above 272K context). Knowledge cutoff Feb 16, 2026.
AgenticReasoningFlagshipSub-agentsPremium
Best for
Frontier agentic coding, deep research, and hardest reasoning tasks
The balanced mid-tier of the GPT-5.6 family — GPT-5.5-class capability at a fraction of the price, built for production workloads at scale.
Verdict
Best OpenAI value — near-flagship capability at 60% off.
Quality score
93%
Pricing
$1.00/1M in
$6.00/1M out
Speed
Balanced
Best for high-volume production and enterprise workloads
Context
1.1M tokens
Launched at $2.50/$15, cut to $2/$12 on July 30, 2026. Long-context above 272K: $4/$18. Part of the government-reviewed GPT-5.6 family, fully public July 9, 2026.
OpenAI: GPT-5 Codex (OpenAI) is now indexed. It supersedes GPT-4o. A serious coding model with repository-scale context that earns its place in any developer's toolkit.
OpenAI: GPT-5 Codex is best for professional developers who need to reason across large codebases, generate production-ready code, and debug complex multi-file projects.. 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 Codex?
You need image generation, creative writing, or general-purpose chat — there are better-value models for non-coding tasks.
What is a cheaper alternative to OpenAI: GPT-5 Codex?
Mistral: Mistral Nemo 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 Codex?
GPT-5.5 is the better pick when response time matters more than maximum depth or premium quality.
Newsletter
Get notified when OpenAI: GPT-5 Codex pricing changes
We track pricing daily. When this model drops or spikes, you'll know first.
No spam. Useful updates only. Affiliate disclosures always clearly labeled.