Claude Sonnet 4 vs Gemini 2.0 Flash vs Gemini 2.5 Pro
Gemini 2.5 Pro comes out ahead, 76 to 65 and 63 on our weighted score, and it is the cheaper option too.
AnthropicClaude Sonnet 4
63/100- ECI141.7
- Price$3.00 / $15.00
- Context200K
GoogleGemini 2.0 Flash
65/100- ECI134.7
- Price—
- Context1.05M
- Our pickGoogle
Gemini 2.5 Pro
76/100- ECI145.3
- Price$1.25 / $10.00
- Context1.05M
Gemini 2.5 Pro is our pick
Gemini 2.5 Pro is the better all-round choice, scoring 76/100 against Gemini 2.0 Flash (65) and Claude Sonnet 4 (63). It leads on capability and inputs & features. The score weighs capability 67%, inputs & features 20%, context window 13%.
- CapabilityGemini 2.5 ProCapabilities Index (ECI): Gemini 2.5 Pro 145.3 · Claude Sonnet 4 141.7 · Gemini 2.0 Flash 134.7
- Lowest priceGemini 2.5 ProGemini 2.5 Pro $3.44 · Claude Sonnet 4 $6.00 per 1M tokens (3:1 blend) · Gemini 2.0 Flash unpriced
- Longest contextGemini 2.0 Flash and Gemini 2.5 ProGemini 2.0 Flash 1,048,576 · Gemini 2.5 Pro 1,048,576 · Claude Sonnet 4 200,000 tokens
- Widest inputsGemini 2.0 Flash and Gemini 2.5 ProClaude Sonnet 4: Text, Images, PDFs · Gemini 2.0 Flash: Text, Images, PDFs, Audio, Video · Gemini 2.5 Pro: Text, Images, PDFs, Audio, Video
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Claude Sonnet 4 | Gemini 2.0 Flash | Gemini 2.5 Pro |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 67% | 68 | 59 | 72 |
| Inputs & features | 20% | 70 | 90 | 100 |
| Context window | 13% | 32 | 61 | 61 |
| Overall | 100% | 63/100 | 65/100 | 76/100 |
Left out because at least one model lacks the data: price. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Claude Sonnet 4Anthropic | Gemini 2.0 FlashGoogle | Gemini 2.5 ProGoogle |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 141.7 | 134.7 | 145.3 (best) |
| ECI rank | #94 of 148 | #116 of 148 | #78 of 148 (best) |
| GPQA DiamondGraduate-level science questions | 79.2% | — | 85.3% (best) |
| FrontierMath Tiers 1–3Research-level mathematics | — | — | 24.6% |
| OTIS Mock AIME 2024–2025Competition mathematics | 71.1% | — | 84.7% (best) |
| SWE-bench VerifiedFixing real GitHub issues | — | — | 57.6% |
| Price per million tokens | |||
| Input | $3.00 | — | $1.25 (best) |
| Output | $15.00 | — | $10.00 (best) |
| Cached input | — | — | $0.125 |
| Blended (3:1) | $6.00 | — | $3.44 (best) |
| Long-context rate | Same rate | — | Over 200K: $2.50 / $15.00 |
| Price source | Median of 9 providers | — | Official Google API |
| Limits | |||
| Context window | 200,000 tokens | 1,048,576 tokens (best) | 1,048,576 tokens (best) |
| Max output | 64,000 tokens | 8,192 tokens | 65,536 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | Yes | Yes |
| Audio | No | Yes | Yes |
| Video | No | Yes | Yes |
| Reasoning | Yes | No | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | Yes | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | — | — | gemini-2.5-pro |
| API providers | 9 | — | 22 (best) |
| Released | May 22, 2025 | Dec 11, 2024 | Jun 17, 2025 |
| Knowledge cutoff | Mar 31, 2025 | Jun 2024 | Jan 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Claude Sonnet 4$60.00
- Gemini 2.0 Flash—
- Gemini 2.5 Pro$32.50
Which should you choose?
Which is better: Claude Sonnet 4, Gemini 2.0 Flash or Gemini 2.5 Pro?
Gemini 2.5 Pro is the better all-round choice, scoring 76/100 against Gemini 2.0 Flash (65) and Claude Sonnet 4 (63). It leads on capability and inputs & features. The score weighs capability 67%, inputs & features 20%, context window 13%.
Which is cheaper, Claude Sonnet 4, Gemini 2.0 Flash or Gemini 2.5 Pro?
Gemini 2.5 Pro is cheaper at $1.25 input / $10.00 output per million tokens (official Google API price). Claude Sonnet 4 costs $3.00 input / $15.00 output per million tokens (median across 9 API providers). At a typical mix of three input tokens to one output token, that is $3.44 per million tokens for Gemini 2.5 Pro versus $6.00 for Claude Sonnet 4 (1.7× as much). Gemini 2.0 Flash has no published per-token price.
Which scores higher on benchmarks?
Gemini 2.5 Pro scores higher on the Capabilities Index (ECI): Gemini 2.5 Pro 145.3 (#78 of 148), Claude Sonnet 4 141.7 (#94 of 148) and Gemini 2.0 Flash 134.7 (#116 of 148). Their confidence ranges do not overlap (143.6–146.9 vs 139.2–142.9), so the gap is a real one.
Which is better for coding?
There are no published SWE-bench Verified results for Claude Sonnet 4 and Gemini 2.0 Flash yet, so there is no like-for-like coding score. On overall capability, Gemini 2.5 Pro leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.
Which has the bigger context window?
Gemini 2.0 Flash and Gemini 2.5 Pro have the largest context windows (1,048,576 and 1,048,576 tokens), against 200,000 for Claude Sonnet 4. Maximum output per response: Claude Sonnet 4 up to 64,000, Gemini 2.0 Flash up to 8,192, Gemini 2.5 Pro up to 65,536 tokens.
Which can read images, PDFs, audio or video?
Claude Sonnet 4 accepts text, images and PDFs; Gemini 2.0 Flash accepts text, images, PDFs, audio and video; Gemini 2.5 Pro accepts text, images, PDFs, audio and video. Gemini 2.0 Flash handles the widest range of inputs.
Are any of these open source?
No. Claude Sonnet 4, Gemini 2.0 Flash and Gemini 2.5 Pro are proprietary and only available through APIs and apps.
Which is newer?
Gemini 2.5 Pro is the newest, released Jun 17, 2025. Claude Sonnet 4 came out May 22, 2025; Gemini 2.0 Flash came out Dec 11, 2024. Knowledge cutoff: Claude Sonnet 4 Mar 31, 2025, Gemini 2.0 Flash Jun 2024, Gemini 2.5 Pro Jan 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
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