o1-pro vs GPT-5.1 Chat
GPT-5.1 Chat comes out ahead, 38 to 27 on our weighted score, and it is the cheaper option too.
OpenAIo1-pro
27/100- ECI—
- Price$150.00 / $600.00
- Context200K
- Our pickOpenAI
GPT-5.1 Chat
38/100- ECI—
- Price$1.25 / $10.00
- Context128K
Add a model
Make it a three-way comparison.
GPT-5.1 Chat is our pick
GPT-5.1 Chat is the better all-round choice, scoring 38/100 against o1-pro (27). It leads on price. o1-pro wins on 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-5.1 ChatGPT-5.1 Chat $3.44 · o1-pro $262.50 per 1M tokens (3:1 blend)
- Longest contexto1-proo1-pro 200,000 · GPT-5.1 Chat 128,000 tokens
- Widest inputsSame inputso1-pro: Text, Images · GPT-5.1 Chat: Text, Images
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | o1-pro | GPT-5.1 Chat |
|---|---|---|---|
| Price | 50% | 0 | 24 |
| Inputs & features | 30% | 70 | 70 |
| Context window | 20% | 32 | 24 |
| Overall | 100% | 27/100 | 38/100 |
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 | o1-proOpenAI | GPT-5.1 ChatOpenAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $150.00 | $1.25 (best) |
| Output | $600.00 | $10.00 (best) |
| Cached input | — | — |
| Blended (3:1) | $262.50 | $3.44 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official OpenAI API | Median of 2 providers |
| Limits | ||
| Context window | 200,000 tokens (best) | 128,000 tokens |
| Max output | 100,000 tokens (best) | 16,384 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yeslow · medium · high | Yes |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | o1-pro | — |
| API providers | 5 (best) | 2 |
| Released | Mar 19, 2025 | Nov 13, 2025 |
| Knowledge cutoff | Sep 2023 | Sep 30, 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- o1-pro$2,700
- GPT-5.1 Chat$32.50
Which should you choose?
Which is better: o1-pro or GPT-5.1 Chat?
GPT-5.1 Chat is the better all-round choice, scoring 38/100 against o1-pro (27). It leads on price. o1-pro wins on 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, o1-pro or GPT-5.1 Chat?
GPT-5.1 Chat is cheaper at $1.25 input / $10.00 output per million tokens (median across 2 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-5.1 Chat versus $262.50 for o1-pro (76× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. o1-pro has not been scored yet and GPT-5.1 Chat has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for o1-pro and GPT-5.1 Chat 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?
o1-pro has the largest context window at 200,000 tokens, against 128,000 for GPT-5.1 Chat. Maximum output per response: o1-pro up to 100,000, GPT-5.1 Chat up to 16,384 tokens.
Which can read images, PDFs, audio or video?
o1-pro accepts text and images; GPT-5.1 Chat accepts text and images. They handle the same number of input types.
Are any of these open source?
No. o1-pro and GPT-5.1 Chat are proprietary and only available through APIs and apps.
Which is newer?
GPT-5.1 Chat is the newest, released Nov 13, 2025. o1-pro came out Mar 19, 2025. Knowledge cutoff: o1-pro Sep 2023, GPT-5.1 Chat Sep 30, 2024.
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.
