AI model comparison
Gemini 2.5 Pro vs Claude Sonnet 4
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Gemini 2.5 Pro
Gemini 2.5 Pro is Google’s state-of-the-art AI model designed for advanced reasoning, coding, mathematics, and scientific tasks.
Gemini 2.5 Pro is scheduled to be retired on October 20, 2026. Consider Gemini 3.1 Pro Preview instead.
- Input / 1M
- $1.25
- Output / 1M
- $10
- Context
- 1.05M
Anthropic
Claude Sonnet 4
Claude Sonnet 4 significantly enhances the capabilities of its predecessor, Sonnet 3.7, excelling in both coding and reasoning tasks with improved precision and controllability.
- Input / 1M
- $3
- Output / 1M
- $15
- Context
- 200K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Gemini 2.5 Pro
1.8x cheaper for a typical chat
Higher intelligence score
Claude Sonnet 4
18.9 vs 16.1 on Artificial Analysis
Larger context window
Gemini 2.5 Pro
1.05M vs 200K tokens
Newer release
Gemini 2.5 Pro
Released June 17, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Gemini 2.5 Pro16.1Claude Sonnet 418.9Coding index
Gemini 2.5 Pro33.3Claude Sonnet 437.6Agentic index
Gemini 2.5 Pro1.6Claude Sonnet 4Not availablePricing
Gemini 2.5 Pro vs Claude Sonnet 4 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Gemini 2.5 Pro | Claude Sonnet 4 |
|---|---|---|
| Input tokensPer 1M tokens | $1.25 | $3 |
| Output tokensPer 1M tokens | $10 | $15 |
| Cached input (read)Per 1M tokens | $0.13 | $0.30 |
| Cache writePer 1M tokens | $0.38 | $3.75 |
| Long-context pricingPer 1M tokens, for very long prompts | $2.50 in / $15 out above 200K | $6 in / $22.50 out above 200K |
| Web searchPer request | $0.014 | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Gemini 2.5 Pro$7.50Claude Sonnet 4$13.50Coding task
30K in, 4K out
Gemini 2.5 Pro$77.50$43.75 cachedClaude Sonnet 4$150$69 cachedLong document summary
150K in, 2K out
Gemini 2.5 Pro$207.50$38.75 cachedClaude Sonnet 4$480$75 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Gemini 2.5 Pro | Claude Sonnet 4 |
|---|---|---|
| Context window | 1.05M tokens | 200K tokens |
| Max output | 66K tokens | 64K tokens |
| Input types | Audio, File, Image, Text, Video | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Not available | Not available |
| Default reasoning effort | Not available | Not available |
| Release date | June 17, 2025 | May 22, 2025 |
Features
Supported features
API features available for each model.
| Metric | Gemini 2.5 Pro | Claude Sonnet 4 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Not supported |
| JSON mode | Supported | Not supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Gemini 2.5 ProView full model details- Gemini 2.5 Pro vs Gemini 3.1 Flash Lite
- Gemini 2.5 Pro vs Gemini 2.5 Flash
- Gemini 2.5 Pro vs Claude Haiku 4.5
- Gemini 2.5 Pro vs Claude Sonnet 4.5
- Gemini 2.5 Pro vs GPT-4.1
- Gemini 2.5 Pro vs o4 Mini
- Gemini 2.5 Pro vs Kimi K2 0905
- Gemini 2.5 Pro vs o1
- Gemini 2.5 Pro vs Mistral Medium 3.5
- Gemini 2.5 Pro vs Command A
- Gemini 2.5 Pro vs Sonar Reasoning Pro
Claude Sonnet 4View full model details- Claude Sonnet 4 vs Claude Sonnet 4.6
- Claude Sonnet 4 vs GPT-5.1
- Claude Sonnet 4 vs GPT-5.1-Codex
- Claude Sonnet 4 vs GPT-5
- Claude Sonnet 4 vs Claude Opus 4.1
- Claude Sonnet 4 vs o3 Pro
- Claude Sonnet 4 vs Qwen3.5 397B A17B
- Claude Sonnet 4 vs Claude Sonnet 4.5
- Claude Sonnet 4 vs o3
- Claude Sonnet 4 vs Claude Haiku 4.5
- Claude Sonnet 4 vs o4 Mini
- Claude Sonnet 4 vs o1
Our take
Gemini 2.5 Pro is 1.8x cheaper for a typical chat. Claude Sonnet 4 scores higher on the Artificial Analysis Intelligence Index (18.9 vs 16.1). Gemini 2.5 Pro has the larger context window (1.05M vs 200K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Gemini 2.5 Pro or Claude Sonnet 4 cheaper?
Gemini 2.5 Pro is cheaper for a typical chat (2K input tokens and 500 output tokens). Gemini 2.5 Pro costs $1.25 per 1M input tokens and $10 per 1M output tokens, while Claude Sonnet 4 costs $3 per 1M input tokens and $15 per 1M output tokens.
Which has a bigger context window, Gemini 2.5 Pro or Claude Sonnet 4?
Gemini 2.5 Pro supports up to 1.05M tokens of context, compared with 200K for Claude Sonnet 4.
Is Gemini 2.5 Pro smarter than Claude Sonnet 4?
On the Artificial Analysis Intelligence Index, Gemini 2.5 Pro scores 16.1 and Claude Sonnet 4 scores 18.9, putting Claude Sonnet 4 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Gemini 2.5 Pro and Claude Sonnet 4 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Gemini 2.5 Pro and Claude Sonnet 4 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Gemini 2.5 Pro and Claude Sonnet 4 at the same time. Compare the answers side by side and keep the best one.