Gemini 2.5 Pro vs Grok 4
Gemini 2.5 Pro and Grok 4 were mid-2025 frontier reasoning models, but they are no longer equal production choices. Gemini 2.5 Pro remains Google's stable GA flagship with a 1M-token context window, multimodal input, and strong coding rows. Grok 4 is retired; use this page for historical comparison and route new xAI evaluations toward Grok 4.3.
Pick Gemini 2.5 Pro for long-context coding assistance, multimodal analysis, and any production comparison against the retired Grok 4 API. If xAI is still on your shortlist, test Grok 4.3 instead: it replaces Grok 4, restores a 1M-token context window, and keeps xAI's much lower $2.50/M output price on the tracked direct route.
Decision scorecard
Local evidence first| Signal | Gemini 2.5 Pro | Grok 4 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 256k |
| Cheapest output | $10/1M tokens | $2.50/1M tokens |
| Provider routes | 4 tracked | 4 tracked |
| Shared benchmarks | 7 shared | MMLU PRO leader |
Decision tradeoffs
- Gemini 2.5 Pro holds a shared-benchmark lead on Aider Polyglot, ahead by 3.5 points.
- Gemini 2.5 Pro has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Local decision data tags Gemini 2.5 Pro for Coding, RAG, and Agents.
- Grok 4 holds a shared-benchmark lead on MMLU PRO, ahead by 0.8 points.
- Grok 4 has the lower cheapest tracked output price at $2.50/1M tokens.
- Local decision data tags Grok 4 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Gemini 2.5 Pro
$3,500
Cheapest tracked route/tier: Google AI Studio <=200K tokens
Grok 4
$1,625
Cheapest tracked route/tier: xAI Console
Estimated monthly gap: $1,875. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Grok 4 is $7.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Gemini 2.5 Pro is $7.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-06-17 | 2025-07-09 |
| Context window | 1m | 256k |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2025-01 | - |
Pricing and availability
| Pricing attribute | Gemini 2.5 Pro | Grok 4 |
|---|---|---|
| Input price |
| $1.25/1M tokens |
| Output price |
| $2.50/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 2.5 Pro | Grok 4 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Gemini 2.5 Pro | Grok 4 |
|---|---|---|
| MMLU PRO | 86.2 | 87.0 |
| SWE-bench Verified | 63.8 | 76.7 |
| Google-Proof Q&A | 86.4 | 87.5 |
| AIME 2025 | 86.7 | 91.7 |
| LiveCodeBench | 75.6 | 79.0 |
| Humanity's Last Exam | 18.8 | 25.4 |
| Aider Polyglot | 83.1 | 79.6 |
Continue comparing
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Last reviewed: 2026-07-10. Data sourced from public model cards and provider documentation.