Leaderboard · Compare · GPT-5 vs Gemini 2.5 Pro · Updated
GPT-5 vs Gemini 2.5 Pro
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 | GPT-5 | Gemini 2.5 Pro |
|---|---|---|
| Provider | OpenAI | |
| Released | 2025-08 | 2025-03 |
| Tier | frontier | frontier |
| License | Closed | Closed |
| Context window | 400k | 2M |
| $ in / out (per 1M) | $1.25 / $10.00 | $1.25 / $10.00 |
Benchmark scoreboard
Higher is better on every benchmark. Δ shows GPT-5 − Gemini 2.5 Pro.
| Benchmark | GPT-5 | Gemini 2.5 Pro | Δ |
|---|---|---|---|
| Chatbot Arena Elo | 1410 | 1380 | +30 |
| MMLU-Pro | 86.8 | 86.0 | +0.8 |
| GPQA Diamond | 87.3 | 84.0 | +3.3 |
| MATH | 96.7 | 92.0 | +4.7 |
| HumanEval | 95.1 | 92.0 | +3.1 |
| SWE-Bench Verified | 74.9 | 63.8 | +11.1 |
Numbers compiled from provider technical reports and Chatbot Arena snapshots — see methodology.
OpenRouter routes GPT-5, Gemini 2.5 Pro, 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)
GPT-5 vs Gemini 2.5 Pro: where each one wins
GPT-5 is stronger on
- Arena
- MMLU-Pro
- GPQA
- MATH
- HumanEval
- SWE-Bench
Gemini 2.5 Pro is stronger on
No benchmarks where Gemini 2.5 Pro beats GPT-5 with comparable data.
Cost comparison
At 10M tokens/day (50/50 split), GPT-5 costs ~$56.25/day vs $56.25/day for Gemini 2.5 Pro — Gemini 2.5 Pro 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, GPT-5 or Gemini 2.5 Pro?
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. GPT-5 wins on Arena, MMLU-Pro, GPQA, MATH, HumanEval, SWE-Bench; Gemini 2.5 Pro wins on no benchmarks.
What does GPT-5 cost compared to Gemini 2.5 Pro?
At 10M tokens/day (50/50 split), GPT-5 costs ~$56.25/day vs $56.25/day for Gemini 2.5 Pro — Gemini 2.5 Pro is the cheaper pick at this volume.
What is the context window of GPT-5 vs Gemini 2.5 Pro?
GPT-5: 400k tokens. Gemini 2.5 Pro: 2M tokens. Gemini 2.5 Pro has the larger window — useful for long-document RAG and full-codebase prompting.
Is GPT-5 or Gemini 2.5 Pro open source?
GPT-5: closed / proprietary. Gemini 2.5 Pro: closed / proprietary.
Can I try GPT-5 and Gemini 2.5 Pro on the same API key?
Yes — OpenRouter routes both models behind a single key, so you can A/B test GPT-5 against Gemini 2.5 Pro without juggling provider accounts.
Model deep-dives: GPT-5 · Gemini 2.5 Pro · Full leaderboard
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