GPT-5-Codex vs o1-pro
GPT-5-Codex comes out ahead, 42 to 27 on our weighted score, and it is the cheaper option too.
- Our pick
OpenAIGPT-5-Codex
42/100- ECI—
- Price$1.25 / $10.00
- Context400K
- OpenAI
o1-pro
27/100- ECI—
- Price$150.00 / $600.00
- Context200K
Add a model
Make it a three-way comparison.
GPT-5-Codex is our pick
GPT-5-Codex is the better all-round choice, scoring 42/100 against o1-pro (27). It leads on price and context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceGPT-5-CodexGPT-5-Codex $3.44 · o1-pro $262.50 per 1M tokens (3:1 blend)
- Longest contextGPT-5-CodexGPT-5-Codex 400,000 · o1-pro 200,000 tokens
- Widest inputsSame inputsGPT-5-Codex: Text, Images · o1-pro: Text, Images
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | GPT-5-Codex | o1-pro |
|---|---|---|---|
| Price | 50% | 24 | 0 |
| Inputs & features | 30% | 70 | 70 |
| Context window | 20% | 44 | 32 |
| Overall | 100% | 42/100 | 27/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-5-CodexOpenAI | o1-proOpenAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $1.25 (best) | $150.00 |
| Output | $10.00 (best) | $600.00 |
| Cached input | — | — |
| Blended (3:1) | $3.44 (best) | $262.50 |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 3 providers | Official OpenAI API |
| Limits | ||
| Context window | 400,000 tokens (best) | 200,000 tokens |
| Max output | 128,000 tokens (best) | 100,000 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yes | Yeslow · medium · high |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | — | o1-pro |
| API providers | 3 | 5 (best) |
| Released | Sep 15, 2025 | Mar 19, 2025 |
| Knowledge cutoff | Sep 30, 2024 | Sep 2023 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-5-Codex$32.50
- o1-pro$2,700
Which should you choose?
Which is better: GPT-5-Codex or o1-pro?
GPT-5-Codex is the better all-round choice, scoring 42/100 against o1-pro (27). It leads on price and context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, GPT-5-Codex or o1-pro?
GPT-5-Codex is cheaper at $1.25 input / $10.00 output per million tokens (median across 3 API providers). o1-pro costs $150.00 input / $600.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $3.44 per million tokens for GPT-5-Codex versus $262.50 for o1-pro (76× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. GPT-5-Codex has not been scored yet and o1-pro has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-5-Codex and o1-pro yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
GPT-5-Codex has the largest context window at 400,000 tokens, against 200,000 for o1-pro. Maximum output per response: GPT-5-Codex up to 128,000, o1-pro up to 100,000 tokens.
Which can read images, PDFs, audio or video?
GPT-5-Codex accepts text and images; o1-pro accepts text and images. They handle the same number of input types.
Are any of these open source?
No. GPT-5-Codex and o1-pro are proprietary and only available through APIs and apps.
Which is newer?
GPT-5-Codex is the newest, released Sep 15, 2025. o1-pro came out Mar 19, 2025. Knowledge cutoff: GPT-5-Codex Sep 30, 2024, o1-pro Sep 2023.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
