Gemini 2.5 Pro vs Grok-2
Gemini 2.5 Pro (2025) and Grok-2 (2024) are frontier-tier reasoning models from Google DeepMind and xAI. Gemini 2.5 Pro ships a 1m-token context window, while Grok-2 ships a 128k-token context window. On HumanEval, Gemini 2.5 Pro leads by 4.7 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Gemini 2.5 Pro fits 8x more tokens; pick it for long-context work and Grok-2 for tighter calls.
Decision scorecard
Local evidence first| Signal | Gemini 2.5 Pro | Grok-2 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Long context |
| Context window | 1m | 128k |
| Cheapest output | $10/1M tokens | $0.50/1M tokens |
| Provider routes | 4 tracked | 1 tracked |
| Shared benchmarks | HumanEval leader | 2 shared |
Decision tradeoffs
- Gemini 2.5 Pro holds a shared-benchmark lead on HumanEval, ahead by 4.7 points.
- Gemini 2.5 Pro has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 2.5 Pro has broader tracked provider coverage for fallback and route flexibility.
- Gemini 2.5 Pro uniquely exposes Vision, Multimodal, and JSON / Tool use in local model data.
- Local decision data tags Gemini 2.5 Pro for Coding, RAG, and Agents.
- Grok-2 has the lower cheapest tracked output price at $0.50/1M tokens.
- Local decision data tags Grok-2 for Coding, RAG, and Long context.
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-2
$525
Cheapest tracked route/tier: SiliconFlow
Estimated monthly gap: $2,975. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Gemini 2.5 Pro and Grok-2; plan for SDK, billing, or endpoint changes.
- Grok-2 is $9.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and JSON / Tool use before moving production traffic.
- No overlapping tracked provider route is sourced for Grok-2 and Gemini 2.5 Pro; plan for SDK, billing, or endpoint changes.
- Gemini 2.5 Pro is $9.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Gemini 2.5 Pro adds Vision, Multimodal, and JSON / Tool use in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-06-17 | 2024-08-01 |
| Context window | 1m | 128k |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Grok License |
| Openness | Proprietary | Open weights |
| Weights | Not released | Unknown |
| 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-2 |
|---|---|---|
| Input price |
| $0.50/1M tokens |
| Output price |
| $0.50/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 2.5 Pro | Grok-2 |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | No |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Gemini 2.5 Pro | Grok-2 |
|---|---|---|
| HumanEval | 93.1 | 88.4 |
| Chatbot Arena | 1398.0 | 1255.0 |
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.