OpenAI: GPT-5 Codex
Analysis Summary
GPT-5 Codex is OpenAI's coding-specialist model, built around software engineering and agentic task execution. Its LiveCodeBench score of 0.84 and agentic index of 62.4 place it firmly in the top tier for coding and multi-step tool use. Vision support, function calling, and a 400K context window round out a strong capability profile for complex engineering workflows.
For businesses, this model is well suited to autonomous coding agents, code review pipelines, and technical documentation tasks. Its math index of 98.7 also makes it a strong candidate for quantitative analysis. The intelligence index of 36.1 is good but not world-class, meaning it may fall short on the most demanding open-ended reasoning tasks compared to frontier models.
At $1.25 input / $10 output per 1M tokens, it is priced for high-value coding work rather than bulk traffic. Teams running software engineering agents or complex code generation pipelines will find it a strong fit.
Assessed July 10, 2026
Editorial notes
GPT-5 Codex from OpenAI delivers exceptional coding performance with a 0.84 LiveCodeBench score, strong agentic capability, vision support, and a 400K context window.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
GPT-5 Codex from OpenAI delivers exceptional coding performance with a 0.84 LiveCodeBench score, strong agentic capability, vision support, and a 400K context window.
Benchmark scores
Magenta = intelligence · Ink = technical/agentic · Cyan = content & long-context · Grey = community benchmarks. Data: Artificial Analysis, Hugging Face.
36.1 Intelligence Index·62.4 Agentic Index·98.7 Math Index
How OpenAI: GPT-5 Codex compares
OpenAI: GPT-5 Codex ranks #57 of 395 AI models we track for overall intelligence, #47 of 302 for agentic tasks. Its 400K-token context window is larger than 80% of the models we list. At $1.25 per million input tokens it is cheaper than 23% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Strongest on content. The pulled-in intelligence corner is the trade-off, and if the shape matters more than the price, this is your model.
Compare shapes side-by-side →Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.25 | $0.001250 |
| Output | $10.00 | $0.010000 |
What would OpenAI: GPT-5 Codex cost your business?
Pick the job that looks most like yours, then fine-tune with the sliders. Estimates update live.
A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 650 models → Price Calculator
These numbers get smaller with the right architecture.
We route routine calls to cheap models and save OpenAI: GPT-5 Codex for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout OpenAI: GPT-5 Codex
GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks..
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Frequently asked questions about OpenAI: GPT-5 Codex
How much does OpenAI: GPT-5 Codex cost?
OpenAI: GPT-5 Codex costs $1.25 per million input tokens and $10.00 per million output tokens.
What is the context window of OpenAI: GPT-5 Codex?
OpenAI: GPT-5 Codex has a context window of 400,000 tokens (400K).
What can OpenAI: GPT-5 Codex do?
OpenAI: GPT-5 Codex supports image/vision input, tool use, and function calling.
Who created OpenAI: GPT-5 Codex?
OpenAI: GPT-5 Codex is developed by OpenAI and was released on September 23, 2025.
