OpenAI · language model
o3 Pro: pricing, context and benchmarks
o3 Pro is a language model from OpenAI released on June 10, 2025. It costs $20 per million input tokens and $80 per million output tokens, with a 200K-token context window. Epoch AI ranks it #67 of 125 rated models.
What you need to know about o3 Pro
o3 Pro was released by OpenAI (United States) on June 10, 2025. It accepts text, files, and images as input and produces text. Its context window reaches 200,000 tokens, larger than 36 % of the models in the registry, and it can write up to 100,000 tokens in one go.
It has been available for about 17 months, long enough for its prices and scores to have settled.
o3 Pro pricing
On OpenRouter, o3 Pro costs $20 per million input tokens and $80 per million output tokens. Counting three tokens read for every token written, its average price is $35 per million, more expensive than 98 % of paid models (45.9 times the median of $0.76).
A concrete example: a task that sends 2,000 tokens (about 1,500 words) and receives a 500-token answer costs $0.08. At 1,000 tasks a day, budget $2,400 a month. The price calculator redoes this with your own volumes.
Performance and benchmarks
The Epoch Capabilities Index (ECI), which aggregates published results across many benchmarks, gives o3 Pro a score of 147.3 (range 145.6 to 150.1). That places it #67 of 125 rated models.
Scores published by Epoch AI on the benchmarks the site tracks:
| Benchmark | What it measures | Score | Date |
|---|---|---|---|
| ARC-AGI-1 | visual abstract-reasoning puzzles | 59.3 % | Jun 10, 2025 |
| ARC-AGI-2 | harder version of the ARC puzzles | 4.9 % | Jun 10, 2025 |
| Aider Polyglot | coding exercises in several languages | 84.9 % | Jun 10, 2025 |
For at least equal performance, Claude Opus 5.5, GPT-6 Astra, and GPT-6.1 Sol cost at least 30% less.
Features, privacy and local use
- It supports tool calling, so it can drive an AI agent, call APIs or MCP servers.
- It can answer in an enforced JSON format (structured outputs).
- It is a reasoning model: it "thinks" before answering, which helps on hard tasks but uses more output tokens.
- Its knowledge stops at June 2024.
Its weights are not published: it can only be used through the OpenAI API or a broker such as OpenRouter, which means sending your data off your machines.
Other OpenAI models
| Model | Released | Avg. price | ECI |
|---|---|---|---|
| GPT-6.1 Sol | Sep 29, 2026 | $4 | 168.4 |
| GPT-6.1 Sol Pro | Sep 29, 2026 | $4 | — |
| GPT-6 Sol | Sep 22, 2026 | $4 | 163.7 |
| GPT-6 Luna | Sep 22, 2026 | $0.2 | 156.8 |
| GPT-6 Luna Pro | Sep 22, 2026 | $0.2 | — |
| GPT-6 Sol Pro | Sep 22, 2026 | $4 | — |
| GPT-6 Astra | Sep 4, 2026 | $20 | 168.8 |
| GPT-6 Astra Pro | Sep 4, 2026 | $20 | — |
Verdict
o3 Pro scores 36/100 on our grid, which only uses published figures.
Strengths
- Agent-ready: tool calling and structured JSON output.
Limitations
- Expensive: costlier than 98 % of paid models.
Avoid if…
- you process large volumes on a tight budget;
- your data must not leave your servers;
- your tasks are mostly simple: a non-reasoning model will cost less.
Alternatives
- Claude Opus 4.5$10
- Claude Opus 4.1$30
- GLM 5.1$2.15
- Claude Sonnet 4.5$6
- Inkling$1.76
- Claude Sonnet 4.6$6
Comparisons and tools
Learn more
Frequently asked questions
How much does o3 Pro cost?
$20 per million input tokens and $80 per million output tokens on OpenRouter (checked October 25, 2026). A task with 2,000 tokens read and 500 written costs $0.08.
How big is o3 Pro's context window?
200,000 tokens, roughly 150,000 words, with a maximum of 100,000 output tokens.
Can o3 Pro run locally?
No, OpenAI does not publish its weights: it is API-only.
Is o3 Pro suitable for an AI agent?
Technically yes: it supports tool calling and structured outputs. Then check its cost for your volume.
How good is o3 Pro?
Epoch AI ranks it #67 of 125 rated models (ECI 147.3). On ARC-AGI-1, it scores 59.3%.
What are the alternatives to o3 Pro?
The closest models on price and performance are Claude Opus 4.5, Claude Opus 4.1, and GLM 5.1.
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Neutrality. No affiliate links. No vendor pays to be reviewed, rated or ranked. Reviews are directed by François Chollet, neutral and factual, and every data point is dated and sourced. How we score