workhorse
Grok 3 vs Gemini 2.5 Pro
Side-by-side pricing, context window, features, and per-use-case verdict. Data sourced from LiteLLM, updated regularly.
Specifications
| Feature | Grok 3 | Gemini 2.5 Pro |
|---|---|---|
| Provider | xai | vertex ai-language-models |
| Model ID | xai/grok-3 | gemini-2.5-pro |
| Input / 1M tokens | $3.00 | $1.25 (58% cheaper) |
| Output / 1M tokens | $15.00 | $10.00 (33% cheaper) |
| Cached input / 1M | $0.75 | $0.13 |
| Context window | 131kk tokens | 1049kk tokens |
| Max output | 131kk tokens | 66kk tokens |
| Vision | ⬜ | ✅ |
| Function calling | ✅ | ✅ |
| Prompt caching | ✅ | ✅ |
| Web search | ✅ | ✅ |
| JSON schema | ⬜ | ✅ |
Monthly cost comparison
No cache discount applied — pure token costs at three usage scales.
| Scale | Grok 3 | Gemini 2.5 Pro | Winner |
|---|---|---|---|
| Small 1M in / 0.2M out | $6.00 | $3.25 | Gemini 2.5 Pro saves 46% |
| Medium 10M in / 2M out | $60.00 | $32.50 | Gemini 2.5 Pro saves 46% |
| Large 100M in / 20M out | $600 | $325 | Gemini 2.5 Pro saves 46% |
Category winners
Cheapest input
Gemini 2.5 Pro
$1.25/M
· 58% less than the other
Cheapest output
Gemini 2.5 Pro
$10.00/M
· 33% less than the other
Larger context
Gemini 2.5 Pro
1049kk tokens · 700% larger window
More features
Gemini 2.5 Pro
5 / 5 capabilities
Better for…
High-volume RAG & repeated context
$0.13/M cached input — prompt caching makes repeated context retrieval significantly cheaper
Gemini 2.5 Pro
Short interactions & high-throughput APIs
$10.00/M output — 33% cheaper on output at scale
Gemini 2.5 Pro
Long-document processing & large codebases
1049k context window vs 131k — 700% larger context
Gemini 2.5 Pro
Agentic workflows & tool use
Supports 5 of 5 tracked capabilities (vision, function calling, caching, web search, JSON schema)
Gemini 2.5 Pro
Deep-dive on each model
Pricing data sourced from LiteLLM and refreshed regularly. Always verify with each provider's official pricing page before making business decisions.