Gemini 2.0 Flash vs Gemini 2.5 Flash Preview 05-20
Too close to call on our weighted score (Gemini 2.0 Flash 67, Gemini 2.5 Flash Preview 05-20 67). The right pick depends on what you value most.
GoogleGemini 2.0 Flash
67/100- ECI134.7
- Price$0.10 / $0.42
- Context1.05M
- Google
Gemini 2.5 Flash Preview 05-20
67/100- ECI141.5
- Price$0.146 / $1.96
- Context1.05M
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Make it a three-way comparison.
Too close to call
It is close. Our weighted score puts them within a point (Gemini 2.0 Flash 67/100, Gemini 2.5 Flash Preview 05-20 67/100), so choose by what matters most for your work: Gemini 2.5 Flash Preview 05-20 for raw capability and Gemini 2.0 Flash on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityGemini 2.5 Flash Preview 05-20Capabilities Index (ECI): Gemini 2.5 Flash Preview 05-20 141.5 · Gemini 2.0 Flash 134.7
- Lowest priceGemini 2.0 FlashGemini 2.0 Flash $0.18 · Gemini 2.5 Flash Preview 05-20 $0.60 per 1M tokens (3:1 blend)
- Longest contextAbout the sameGemini 2.0 Flash 1,048,576 · Gemini 2.5 Flash Preview 05-20 1,048,576 tokens
- Widest inputsSame inputsGemini 2.0 Flash: Text, Images, PDFs, Audio, Video · Gemini 2.5 Flash Preview 05-20: Text, Images, PDFs, Audio, Video
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Gemini 2.0 Flash | Gemini 2.5 Flash Preview 05-20 |
|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 58 | 66 |
| Price | 25% | 82 | 58 |
| Inputs & features | 15% | 80 | 90 |
| Context window | 10% | 61 | 61 |
| Overall | 100% | 67/100 | 67/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Gemini 2.0 FlashGoogle | Gemini 2.5 Flash Preview 05-20Google |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 134.7 | 141.5 (best) |
| ECI rank | #130 of 165 | #106 of 165 (best) |
| GPQA DiamondGraduate-level science questions | 64.1% | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 31.1% | 70.8% (best) |
| Price per million tokens | ||
| Input | $0.10 (best) | $0.146 |
| Output | $0.42 (best) | $1.96 |
| Cached input | — | — |
| Blended (3:1) | $0.18 (best) | $0.60 |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 1 providers | Median of 2 providers |
| Limits | ||
| Context window | 1,048,576 tokens | 1,048,576 tokens |
| Max output | 8,192 tokens | 65,536 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | Yes | Yes |
| Audio | Yes | Yes |
| Video | Yes | Yes |
| Reasoning | No | Yes |
| Tool calling | Yes | Yes |
| Structured output | No | No |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | — | — |
| API providers | 2 | 2 |
| Released | Dec 11, 2024 | May 20, 2025 |
| Knowledge cutoff | 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.
- Gemini 2.0 Flash$1.84
- Gemini 2.5 Flash Preview 05-20$5.39
Which should you choose?
Which is better: Gemini 2.0 Flash or Gemini 2.5 Flash Preview 05-20?
It is close. Our weighted score puts them within a point (Gemini 2.0 Flash 67/100, Gemini 2.5 Flash Preview 05-20 67/100), so choose by what matters most for your work: Gemini 2.5 Flash Preview 05-20 for raw capability and Gemini 2.0 Flash on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, Gemini 2.0 Flash or Gemini 2.5 Flash Preview 05-20?
Gemini 2.0 Flash is cheaper at $0.10 input / $0.42 output per million tokens (median across 1 API provider). Gemini 2.5 Flash Preview 05-20 costs $0.146 input / $1.96 output per million tokens (median across 2 API providers). At a typical mix of three input tokens to one output token, that is $0.18 per million tokens for Gemini 2.0 Flash versus $0.60 for Gemini 2.5 Flash Preview 05-20 (3.3× as much).
Which scores higher on benchmarks?
Gemini 2.5 Flash Preview 05-20 scores higher on the Capabilities Index (ECI): Gemini 2.5 Flash Preview 05-20 141.5 (#106 of 165) and Gemini 2.0 Flash 134.7 (#130 of 165). Their confidence ranges do not overlap (139.3–142.9 vs 131.4–136.5), so the gap is a real one. On individual benchmarks: OTIS Mock AIME 2024–2025 — Gemini 2.5 Flash Preview 05-20 70.8%, Gemini 2.0 Flash 31.1%.
Which is better for coding?
There are no published SWE-bench Verified results for Gemini 2.0 Flash and Gemini 2.5 Flash Preview 05-20 yet, so there is no like-for-like coding score. On overall capability, Gemini 2.5 Flash Preview 05-20 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.
Which has the bigger context window?
Gemini 2.0 Flash and Gemini 2.5 Flash Preview 05-20 share the same 1,048,576-token context window. Maximum output per response: Gemini 2.0 Flash up to 8,192, Gemini 2.5 Flash Preview 05-20 up to 65,536 tokens.
Which can read images, PDFs, audio or video?
Gemini 2.0 Flash accepts text, images, PDFs, audio and video; Gemini 2.5 Flash Preview 05-20 accepts text, images, PDFs, audio and video. They handle the same number of input types.
Are any of these open source?
No. Gemini 2.0 Flash and Gemini 2.5 Flash Preview 05-20 are proprietary and only available through APIs and apps.
Which is newer?
Gemini 2.5 Flash Preview 05-20 is the newest, released May 20, 2025. Gemini 2.0 Flash came out Dec 11, 2024. Knowledge cutoff: Gemini 2.0 Flash Jun 2024, Gemini 2.5 Flash Preview 05-20 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 Nov 2, 2026.
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