GPT-5.1 vs o3-pro
At a Glance
| Compare |  GPT-5.1OpenAI | o3-proOpenAI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #37 of 4625.7 score · 2/3 sources · provisional · missing LiveBench · full-core range 17.1–50.5 | UnrankedNot in the 46-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $1.25Openai ↗ · Sep 3, 2026 | $20.00Openai ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $10.00Openai ↗ · Sep 3, 2026 | $80.00Openai ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 400K | 200K |
| Model facts checked | Sep 3, 2026View model evidence → | Sep 3, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | GPT-5.1 | o3-pro |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Family | Gpt 5 1 | O3 |
| Model | GPT-5.1 | o3-pro |
| Version | GPT-5.1 | o3-pro |
| Lifecycle | active | active |
| Released | 2025-11-13 | 2025-06-10 |
| Knowledge cutoff | 2024-09-30 | 2024-06-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 400K | 200K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Openai (Standard), Openrouter (Standard) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
GPT-5.1 Capabilities
o3-pro Capabilities
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Primary Evidence
Sources and Freshness
Questions
GPT-5.1 vs o3-pro FAQs
Is GPT-5.1 or o3-pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.1 and o3-pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.1 or o3-pro?+
GPT-5.1 is $1.25 and o3-pro is $20.00 per million tokens, so GPT-5.1 is cheaper on this metric. GPT-5.1 is $10.00 and o3-pro is $80.00 per million tokens, so GPT-5.1 is cheaper on this metric.
Which has a larger context window, GPT-5.1 or o3-pro?+
GPT-5.1 has the larger sourced context window. GPT-5.1 supports 400K and o3-pro supports 200K.
Which performs better in benchmarks, GPT-5.1 or o3-pro?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can GPT-5.1 or o3-pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.1 is not marked open weight; o3-pro is not marked open weight.
Can GPT-5.1 and o3-pro understand images?+
GPT-5.1 is documented with image input; o3-pro is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.1 or o3-pro?+
GPT-5.1 has the larger sourced maximum output: GPT-5.1 supports 128K and o3-pro supports 100K output tokens.
Do GPT-5.1 and o3-pro support reasoning and tool use?+
GPT-5.1: reasoning, tool calling, and image input. o3-pro: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.1 or o3-pro?+
GPT-5.1 has 2 sourced provider routes; o3-pro has 2, a tie.
Which offers better value, GPT-5.1 or o3-pro?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.