Leaderboard · Compare · Gemini 2.5 Pro vs GPT-5 · Updated
Gemini 2.5 Pro vs GPT-5
GPT-5 edges out Gemini 2.5 Pro on the composite (86.0 vs 80.9). The gap is meaningful but not decisive — see the per-benchmark breakdown below.
At a glance
| Spec | Gemini 2.5 Pro | GPT-5 |
|---|---|---|
| Provider | OpenAI | |
| Released | 2025-03 | 2025-08 |
| Tier | frontier | frontier |
| License | Closed | Closed |
| Context window | 2M | 400k |
| $ in / out (per 1M) | $1.25 / $10.00 | $1.25 / $10.00 |
Benchmark scoreboard
Higher is better on every benchmark. Δ shows Gemini 2.5 Pro − GPT-5.
| Benchmark | Gemini 2.5 Pro | GPT-5 | Δ |
|---|---|---|---|
| Chatbot Arena Elo | 1380 | 1410 | -30 |
| MMLU-Pro | 86.0 | 86.8 | -0.8 |
| GPQA Diamond | 84.0 | 87.3 | -3.3 |
| MATH | 92.0 | 96.7 | -4.7 |
| HumanEval | 92.0 | 95.1 | -3.1 |
| SWE-Bench Verified | 63.8 | 74.9 | -11.1 |
Numbers compiled from provider technical reports and Chatbot Arena snapshots — see methodology.
OpenRouter routes Gemini 2.5 Pro, GPT-5, and 100+ other LLMs behind a single API key — pay-as-you-go, no monthly minimum, fallback if a provider is down. Try OpenRouter → (affiliate · supports this site)
Gemini 2.5 Pro vs GPT-5: where each one wins
Gemini 2.5 Pro is stronger on
No benchmarks where Gemini 2.5 Pro beats GPT-5 with comparable data.
GPT-5 is stronger on
- Arena
- MMLU-Pro
- GPQA
- MATH
- HumanEval
- SWE-Bench
Cost comparison
At 10M tokens/day (50/50 split), Gemini 2.5 Pro costs ~$56.25/day vs $56.25/day for GPT-5 — GPT-5 is the cheaper pick at this volume.
Verdict
GPT-5 edges out Gemini 2.5 Pro on the composite (86.0 vs 80.9). The gap is meaningful but not decisive — see the per-benchmark breakdown below.
If you can only pick one and your workload is unclear, route via OpenRouter and switch by request — same key, no lock-in.
Frequently asked questions
Which is better, Gemini 2.5 Pro or GPT-5?
GPT-5 edges out Gemini 2.5 Pro on the composite (86.0 vs 80.9). The gap is meaningful but not decisive — see the per-benchmark breakdown below. Gemini 2.5 Pro wins on no benchmarks; GPT-5 wins on Arena, MMLU-Pro, GPQA, MATH, HumanEval, SWE-Bench.
What does Gemini 2.5 Pro cost compared to GPT-5?
At 10M tokens/day (50/50 split), Gemini 2.5 Pro costs ~$56.25/day vs $56.25/day for GPT-5 — GPT-5 is the cheaper pick at this volume.
What is the context window of Gemini 2.5 Pro vs GPT-5?
Gemini 2.5 Pro: 2M tokens. GPT-5: 400k tokens. Gemini 2.5 Pro has the larger window — useful for long-document RAG and full-codebase prompting.
Is Gemini 2.5 Pro or GPT-5 open source?
Gemini 2.5 Pro: closed / proprietary. GPT-5: closed / proprietary.
Can I try Gemini 2.5 Pro and GPT-5 on the same API key?
Yes — OpenRouter routes both models behind a single key, so you can A/B test Gemini 2.5 Pro against GPT-5 without juggling provider accounts.
Model deep-dives: Gemini 2.5 Pro · GPT-5 · Full leaderboard
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