Gemini 2.5 Pro vs Grok 4
A complete head-to-head: pricing, context window, benchmarks, modality coverage, and openness, with a programmatic verdict synthesized from the underlying data.
Updated
Gemini 2.5 Pro specs · Grok 4 specs- PriceGemini 2.5 Pro
Gemini 2.5 Pro is roughly 1.5× cheaper on output tokens ($10.00 vs $15.00 per 1M).
- Context windowGemini 2.5 Pro
Gemini 2.5 Pro accepts 2.1M tokens vs 256K, 8.2× the room for long documents and codebases.
- BenchmarksGrok 4
Grok 4 leads in 1 of 1 shared benchmarks; the biggest gap is on GPQA (graduate-level reasoning), where it scores 87.5 vs 84.0.
- ModalitiesGemini 2.5 Pro
Gemini 2.5 Pro supports 4 modalities (text, vision, audio, video) vs 2 for Grok 4.
- OpennessTie
Both are closed-weight, API-only.
On balance Gemini 2.5 Pro edges ahead, winning 3 of 5 categories against Grok 4's 1. Gemini 2.5 Pro is roughly 1.5× cheaper on output tokens ($10.00 vs $15.00 per 1M). Gemini 2.5 Pro accepts 2.1M tokens vs 256K, 8.2× the room for long documents and codebases.
Grok 4 leads in 1 of 1 shared benchmarks; the biggest gap is on GPQA (graduate-level reasoning), where it scores 87.5 vs 84.0. They differ in modality coverage, Gemini 2.5 Pro handles text, vision, audio, video while Grok 4 handles text, vision, which can be the deciding factor before you even look at benchmarks. Both are closed-weight, API-only.
Grok 4 is the newer of the two, released 4 months after Gemini 2.5 Pro, which usually means a more recent knowledge cutoff and updated safety post-training. Gemini 2.5 Pro is usually picked for long context and rag workloads, while Grok 4 sees more deployments in reasoning and research agent. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.
Side-by-side specs
| Spec | Gemini 2.5 Pro | Grok 4 |
|---|---|---|
| Provider | xAI | |
| Released | Mar 2025 | Jul 2025 |
| Modalities | text, vision, audio, video | text, vision |
| Context window | 2.1M tokens | 256K tokens |
| Max output | , | , |
| Input · 1M | $1.25 / 1M tokens | $3.00 / 1M tokens |
| Output · 1M | $10.00 / 1M tokens | $15.00 / 1M tokens |
| Knowledge cutoff | 2025-01 | 2024-11 |
| Open weights | No | No |
| API available | Yes | Yes |
Pricing at scale
What you'd actually pay at typical workloads. Numbers come from each model's published per-million-token rates.
- Light usage, 100k in / 50k out per day$18.75 vs $31.50
- Heavy usage, 1M in / 500k out per day$188 vs $315
- RAG workload, 5M in / 200k out per day$248 vs $540
Light usage, 100k in / 50k out per day: $18.75 vs $31.50 per month, model A comes out ahead. Heavy usage, 1M in / 500k out per day: $188 vs $315 per month, model A comes out ahead. RAG workload, 5M in / 200k out per day: $248 vs $540 per month, model A comes out ahead.
Estimated spend for the listed models at your usage. Numbers are derived from each model's published per-million-token rates.
- Gemini 2.5 Pro$0.625
- Grok 4$1.05
Benchmarks compared
Only sourced numbers. Where a benchmark is missing for one model we show the available value rather than fabricating the other.
- MMLU86.0
- GPQA84.087.5
Gemini 2.5 Pro fits when…
- 2M-token context window
- Strong on long-document tasks
- Native multimodal handling
- Cost-sensitive workloads, 1.5× cheaper than Grok 4 on output tokens.
- Long-context tasks, handles 2.1M tokens vs 256K for Grok 4.
Grok 4 fits when…
- Real-time X data access
- Strong on benchmarks at launch
- Less restrictive content policy than peers
Consider Gemini 3 Pro
Google's late-2025 flagship, set new benchmarks on long-context, vision, and reasoning at competitive pricing.
Frequently asked
Is Gemini 2.5 Pro or Grok 4 cheaper?
Gemini 2.5 Pro is cheaper at $10.00 / 1M tokens per million output tokens, vs $15.00 / 1M tokens for Grok 4.Which has the larger context window?
Gemini 2.5 Pro accepts 2.1M tokens vs 256K for Grok 4.Is Gemini 2.5 Pro or Grok 4 better for coding?
Both Gemini 2.5 Pro and Grok 4 are competitive on coding benchmarks. See each model's individual spec page for HumanEval and SWE-bench scores where published. For an opinionated pick, consult our Best LLM for Coding ranking.Are either of these models open source?
Neither model ships open weights, both are accessible only via their respective providers' APIs.When were Gemini 2.5 Pro and Grok 4 released?
Gemini 2.5 Pro was released by Google on 2025-03-25. Grok 4 was released by xAI on 2025-07-09.
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