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Gemini 2.5 Pro vs OpenAI o1
Which AI model is better in 2026? Compare Gemini 2.5 Pro and OpenAI o1 on benchmarks, pricing, speed, context window, and real-world fit.
Quick summary
Gemini 2.5 Pro is currently the stronger overall pick for reasoning, context, speed, and price. OpenAI o1 wins on coding and math. Gemini 2.5 Pro is also cheaper on blended API price ($2.19 vs $26.25 / 1M).
Overall winner
Gemini 2.5 Pro
Gemini 2.5 Pro wins
- Reasoning
- Context
- Speed
- Price
OpenAI o1 wins
- Coding
- Math
Want to compare different models?
Pick any two modelsGemini 2.5 Pro vs OpenAI o1: overview
Gemini 2.5 Pro (Google) and OpenAI o1 (OpenAI) are frequently compared by teams choosing an AI stack in 2026. Gemini 2.5 Pro: 2M-token context + native multimodality — unbeatable for huge docs. OpenAI o1: Long chain-of-thought reasoning — unbeatable on hard math and code. This Gemini 2.5 Pro vs OpenAI o1 comparison covers benchmarks, pricing, context window, speed, modalities, strengths, weaknesses, and who should pick which model.
Gemini 2.5 Pro is proprietary with a 2M-token context window and a blended API price near $2.19 / 1M tokens (intelligence index 78/100). OpenAI o1 is proprietary with 200k context at about $26.25 blended / 1M (intelligence 76/100). Those gaps drive most “Gemini 2.5 Pro vs OpenAI o1” searches — quality versus cost, closed versus open, cloud versus self-host.
Where they differ most: Gemini 2.5 Pro tends to lead on reasoning, context, speed, and price, while OpenAI o1 leads on coding and math. Choose Gemini 2.5 Pro when you want the stronger overall profile on our scorecard; validate with your own evals before migrating production traffic.
Gemini 2.5 Pro is often shortlisted for whole-codebase analysis, long-doc workflows, and video qa. OpenAI o1 fits research problems, olympiad-level math, and algorithm design. Scroll to pricing, real-world tasks, and the who-should-choose section for decision support.
People search “Gemini 2.5 Pro vs OpenAI o1”, “which is better”, and “Gemini 2.5 Pro vs OpenAI o1 pricing” for the same reason: switching models is expensive if quality drops, and staying put is expensive if you overpay. Use the winner card for a fast answer, the head-to-head table for receipts, and the editorial verdict for a human recommendation. Gemini 2.5 Pro currently ranks among frontier options from Google; OpenAI o1 is a hosted alternative from OpenAI. If API pricing is your main concern, start with the pricing section; for multimodal workloads, check vision/audio rows in technical differences; for agents and long documents, prioritize context and reasoning wins.
Head to head
Pricing comparison
API cost is often the deciding factor in Gemini 2.5 Pro vs OpenAI o1 for high-volume apps. Figures below use catalog list prices with a 3:1 input:output blend for monthly estimates. Cached input, batch, and realtime surcharges vary by provider — confirm on official docs.
| API cost | Gemini 2.5 Pro | OpenAI o1 |
|---|---|---|
| Input / 1M tokens | $1.25 | $15.00 |
| Output / 1M tokens | $5.00 | $60.00 |
| Blended (3:1) / 1M | $2.19 | $26.25 |
| Est. cost @ 1M blended tokens | $2.19 | $26.25 |
| Est. cost @ 10M blended tokens | $21.90 | $262.50 |
| Est. cost @ 100M blended tokens | $219.00 | $2625.00 |
Cached input, batch API, and realtime surcharges are provider-specific and not always published in our catalog — verify on official pricing pages.
Benchmark showdown
OpenAI o1 leads on MMLU, MMLU Pro, GPQA, MATH, and HumanEval. Gemini 2.5 Pro also undercuts on blended API price. Raw benchmarks shortlist models — run task-specific evals before you switch.
Real-world performance
Beyond academic scores, here is how Gemini 2.5 Pro vs OpenAI o1 tends to split common product tasks based on catalog strengths, price, and modalities.
| Task | Winner |
|---|---|
| Coding | OpenAI o1 |
| Blog writing | Gemini 2.5 Pro |
| Research | Gemini 2.5 Pro |
| Customer support | Gemini 2.5 Pro |
| Cheap API / high volume | Gemini 2.5 Pro |
| AI agents | Gemini 2.5 Pro |
| Summarization | Gemini 2.5 Pro |
| Translation | Gemini 2.5 Pro |
| Vision / multimodal | Gemini 2.5 Pro |
| Self-hosting / open weights | Gemini 2.5 Pro |
Technical differences
| Feature | Gemini 2.5 Pro | OpenAI o1 |
|---|---|---|
| Provider | OpenAI | |
| License | Proprietary | Proprietary |
| Pricing model | tokens | tokens |
| Context window | 2M tokens | 200k tokens |
| Max output | 66k tokens | 100k tokens |
| Vision input | Yes | Yes |
| Audio input | Yes | No |
| Text output | Yes | Yes |
| Image output | No | No |
| Video output | No | No |
| Audio output | No | No |
| Self-host friendly | No | No |
| Docs | Available | Available |
Strengths, weaknesses and best-for
- 2M context
- Native video understanding
- Strong on math
- Output ceiling lower than competitors
- Whole-codebase analysis
- Long-doc workflows
- Video QA
- Tops MATH and GPQA leaderboards
- Self-checks its work
- Very slow
- Very expensive
- Overkill for simple tasks
- Research problems
- Olympiad-level math
- Algorithm design
Who should choose which
Choose Gemini 2.5 Pro if
- You need stronger reasoning, coding, or math quality
- You need a larger context window
- You care about faster token throughput
- API budget is the top constraint
- Whole-codebase analysis
Choose OpenAI o1 if
- You need stronger reasoning, coding, or math quality
- Research problems
- Olympiad-level math
Pros & cons
Gemini 2.5 Pro
Pros
- 2M context
- Native video understanding
- Strong on math
Cons
- Output ceiling lower than competitors
OpenAI o1
Pros
- Tops MATH and GPQA leaderboards
- Self-checks its work
Cons
- Very slow
- Very expensive
- Overkill for simple tasks
Editorial verdict
Gemini 2.5 Pro edges this matchup — with caveats
Gemini 2.5 Pro is the better choice when you prioritize reasoning, context, speed, and price. OpenAI o1 stands out for coding and math, making it a strong option when those dimensions matter more than raw leaderboard rank. If maximum measured performance matters, Gemini 2.5 Pro wins this matchup. If your niche constraints matter more, OpenAI o1 is difficult to beat. Always confirm with a bake-off on your real prompts before cutting over.
Still deciding? Read the full Gemini 2.5 Pro review and OpenAI o1 review, or open the full AI models table.
Gemini 2.5 Pro vs OpenAI o1 — frequently asked questions
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