Leaderboard · Compare · Grok 4 vs Gemini 2.5 Pro · Updated
Grok 4 vs Gemini 2.5 Pro
Grok 4 edges out Gemini 2.5 Pro on the composite (83.6 vs 80.9). The gap is meaningful but not decisive — see the per-benchmark breakdown below.
At a glance
| Spec | Grok 4 | Gemini 2.5 Pro |
|---|---|---|
| Provider | xAI | |
| Released | 2025-07 | 2025-03 |
| Tier | frontier | frontier |
| License | Closed | Closed |
| Context window | 256k | 2M |
| $ in / out (per 1M) | $3.00 / $15.00 | $1.25 / $10.00 |
Benchmark scoreboard
Higher is better on every benchmark. Δ shows Grok 4 − Gemini 2.5 Pro.
| Benchmark | Grok 4 | Gemini 2.5 Pro | Δ |
|---|---|---|---|
| Chatbot Arena Elo | 1378 | 1380 | -2 |
| MMLU-Pro | 86.6 | 86.0 | +0.6 |
| GPQA Diamond | 87.7 | 84.0 | +3.7 |
| MATH | 95.0 | 92.0 | +3.0 |
| HumanEval | 93.0 | 92.0 | +1.0 |
| SWE-Bench Verified | 72.0 | 63.8 | +8.2 |
Numbers compiled from provider technical reports and Chatbot Arena snapshots — see methodology.
OpenRouter routes Grok 4, 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)
Grok 4 vs Gemini 2.5 Pro: where each one wins
Grok 4 is stronger on
- MMLU-Pro
- GPQA
- MATH
- HumanEval
- SWE-Bench
Gemini 2.5 Pro is stronger on
- Arena
Cost comparison
At 10M tokens/day (50/50 split), Grok 4 costs ~$90.00/day vs $56.25/day for Gemini 2.5 Pro — Gemini 2.5 Pro is the cheaper pick at this volume.
Verdict
Grok 4 edges out Gemini 2.5 Pro on the composite (83.6 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, Grok 4 or Gemini 2.5 Pro?
Grok 4 edges out Gemini 2.5 Pro on the composite (83.6 vs 80.9). The gap is meaningful but not decisive — see the per-benchmark breakdown below. Grok 4 wins on MMLU-Pro, GPQA, MATH, HumanEval, SWE-Bench; Gemini 2.5 Pro wins on Arena.
What does Grok 4 cost compared to Gemini 2.5 Pro?
At 10M tokens/day (50/50 split), Grok 4 costs ~$90.00/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 Grok 4 vs Gemini 2.5 Pro?
Grok 4: 256k 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 Grok 4 or Gemini 2.5 Pro open source?
Grok 4: closed / proprietary. Gemini 2.5 Pro: closed / proprietary.
Can I try Grok 4 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 Grok 4 against Gemini 2.5 Pro without juggling provider accounts.
Model deep-dives: Grok 4 · Gemini 2.5 Pro · Full leaderboard
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