Gemini 2.0 Flash vs Claude Sonnet 3.5 v2 vs Claude Sonnet 4
Too close to call on our weighted score (Gemini 2.0 Flash 65, Claude Sonnet 4 63, Claude Sonnet 3.5 v2 54). The right pick depends on what you value most.
GoogleGemini 2.0 Flash
65/100- ECI134.7
- Price—
- Context1.05M
AnthropicClaude Sonnet 3.5 v2
54/100- ECI133.5
- Price$3.00 / $15.00
- Context200K
- Anthropic
Claude Sonnet 4
63/100- ECI141.7
- Price$3.00 / $15.00
- Context200K
Too close to call
It is close. Our weighted score puts them within 2 points (Gemini 2.0 Flash 65/100, Claude Sonnet 4 63/100, Claude Sonnet 3.5 v2 54/100), so choose by what matters most for your work: Claude Sonnet 4 for raw capability, Claude Sonnet 3.5 v2 on price and Gemini 2.0 Flash for long inputs. The score weighs capability 67%, inputs & features 20%, context window 13%.
- CapabilityClaude Sonnet 4Capabilities Index (ECI): Claude Sonnet 4 141.7 · Gemini 2.0 Flash 134.7 · Claude Sonnet 3.5 v2 133.5
- Lowest priceClaude Sonnet 3.5 v2 and Claude Sonnet 4Claude Sonnet 3.5 v2 $6.00 · Claude Sonnet 4 $6.00 per 1M tokens (3:1 blend) · Gemini 2.0 Flash unpriced
- Longest contextGemini 2.0 FlashGemini 2.0 Flash 1,048,576 · Claude Sonnet 3.5 v2 200,000 · Claude Sonnet 4 200,000 tokens
- Widest inputsGemini 2.0 FlashGemini 2.0 Flash: Text, Images, PDFs, Audio, Video · Claude Sonnet 3.5 v2: Text, Images, PDFs · Claude Sonnet 4: Text, Images, PDFs
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Gemini 2.0 Flash | Claude Sonnet 3.5 v2 | Claude Sonnet 4 |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 67% | 59 | 57 | 68 |
| Inputs & features | 20% | 90 | 60 | 70 |
| Context window | 13% | 61 | 32 | 32 |
| Overall | 100% | 65/100 | 54/100 | 63/100 |
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 | Gemini 2.0 FlashGoogle | Claude Sonnet 3.5 v2Anthropic | Claude Sonnet 4Anthropic |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 134.7 | 133.5 | 141.7 (best) |
| ECI rank | #116 of 148 | #119 of 148 | #94 of 148 (best) |
| GPQA DiamondGraduate-level science questions | — | 55.3% | 79.2% (best) |
| OTIS Mock AIME 2024–2025Competition mathematics | — | 8.5% | 71.1% (best) |
| Price per million tokens | |||
| Input | — | $3.00 | $3.00 |
| Output | — | $15.00 | $15.00 |
| Cached input | — | — | — |
| Blended (3:1) | — | $6.00 | $6.00 |
| Long-context rate | — | Same rate | Same rate |
| Price source | — | Median of 1 providers | Median of 9 providers |
| Limits | |||
| Context window | 1,048,576 tokens (best) | 200,000 tokens | 200,000 tokens |
| Max output | 8,192 tokens | 8,192 tokens | 64,000 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | Yes | Yes |
| Audio | Yes | No | No |
| Video | Yes | No | No |
| Reasoning | No | No | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | — | — | — |
| API providers | — | 1 | 9 (best) |
| Released | Dec 11, 2024 | Oct 22, 2024 | May 22, 2025 |
| Knowledge cutoff | Jun 2024 | Apr 30, 2024 | Mar 31, 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Gemini 2.0 Flash—
- Claude Sonnet 3.5 v2$60.00
- Claude Sonnet 4$60.00
Which should you choose?
Which is better: Gemini 2.0 Flash, Claude Sonnet 3.5 v2 or Claude Sonnet 4?
It is close. Our weighted score puts them within 2 points (Gemini 2.0 Flash 65/100, Claude Sonnet 4 63/100, Claude Sonnet 3.5 v2 54/100), so choose by what matters most for your work: Claude Sonnet 4 for raw capability, Claude Sonnet 3.5 v2 on price and Gemini 2.0 Flash for long inputs. The score weighs capability 67%, inputs & features 20%, context window 13%.
Which is cheaper, Gemini 2.0 Flash, Claude Sonnet 3.5 v2 or Claude Sonnet 4?
Claude Sonnet 3.5 v2 is cheaper at $3.00 input / $15.00 output per million tokens (median across 1 API provider). 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 $6.00 per million tokens for Claude Sonnet 3.5 v2 versus $6.00 for Claude Sonnet 4 (1× as much). Gemini 2.0 Flash has no published per-token price.
Which scores higher on benchmarks?
Claude Sonnet 4 scores higher on the Capabilities Index (ECI): Claude Sonnet 4 141.7 (#94 of 148), Gemini 2.0 Flash 134.7 (#116 of 148) and Claude Sonnet 3.5 v2 133.5 (#119 of 148). Their confidence ranges do not overlap (139.2–142.9 vs 124.3–136.7), so the gap is a real one.
Which is better for coding?
There are no published SWE-bench Verified results for Gemini 2.0 Flash, Claude Sonnet 3.5 v2 and Claude Sonnet 4 yet, so there is no like-for-like coding score. On overall capability, Claude Sonnet 4 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 has the largest context window at 1,048,576 tokens, against 200,000 for Claude Sonnet 3.5 v2 and 200,000 for Claude Sonnet 4. Maximum output per response: Gemini 2.0 Flash up to 8,192, Claude Sonnet 3.5 v2 up to 8,192, Claude Sonnet 4 up to 64,000 tokens.
Which can read images, PDFs, audio or video?
Gemini 2.0 Flash accepts text, images, PDFs, audio and video; Claude Sonnet 3.5 v2 accepts text, images and PDFs; Claude Sonnet 4 accepts text, images and PDFs. Gemini 2.0 Flash handles the widest range of inputs.
Are any of these open source?
No. Gemini 2.0 Flash, Claude Sonnet 3.5 v2 and Claude Sonnet 4 are proprietary and only available through APIs and apps.
Which is newer?
Claude Sonnet 4 is the newest, released May 22, 2025. Gemini 2.0 Flash came out Dec 11, 2024; Claude Sonnet 3.5 v2 came out Oct 22, 2024. Knowledge cutoff: Gemini 2.0 Flash Jun 2024, Claude Sonnet 3.5 v2 Apr 30, 2024, Claude Sonnet 4 Mar 31, 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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