Gemini 2.5 Flash Preview 05-20 vs DeepSeek V3 0324
Gemini 2.5 Flash Preview 05-20 comes out ahead, 67 to 52 on our weighted score, though DeepSeek V3 0324 is 19% cheaper per token.
- Our pick
GoogleGemini 2.5 Flash Preview 05-20
67/100- ECI141.5
- Price$0.146 / $1.96
- Context1.05M
DeepSeekDeepSeek V3 0324
52/100- ECI135.9
- Price$0.275 / $1.12
- Context164K
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Make it a three-way comparison.
Gemini 2.5 Flash Preview 05-20 is our pick
Gemini 2.5 Flash Preview 05-20 is the better all-round choice, scoring 67/100 against DeepSeek V3 0324 (52). It leads on capability, inputs & features and context window. DeepSeek V3 0324 wins 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 · DeepSeek V3 0324 135.9
- Lowest priceDeepSeek V3 0324DeepSeek V3 0324 $0.486 · Gemini 2.5 Flash Preview 05-20 $0.60 per 1M tokens (3:1 blend)
- Longest contextGemini 2.5 Flash Preview 05-20Gemini 2.5 Flash Preview 05-20 1,048,576 · DeepSeek V3 0324 163,840 tokens
- Widest inputsGemini 2.5 Flash Preview 05-20Gemini 2.5 Flash Preview 05-20: Text, Images, PDFs, Audio, Video · DeepSeek V3 0324: Text
- Self-hostingDeepSeek V3 0324Publishes downloadable weights
| Measure | Weight | Gemini 2.5 Flash Preview 05-20 | DeepSeek V3 0324 |
|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 66 | 59 |
| Price | 25% | 58 | 62 |
| Inputs & features | 15% | 90 | 25 |
| Context window | 10% | 61 | 28 |
| Overall | 100% | 67/100 | 52/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Gemini 2.5 Flash Preview 05-20Google | DeepSeek V3 0324DeepSeek |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 141.5 (best) | 135.9 |
| ECI rank | #106 of 165 (best) | #128 of 165 |
| GPQA DiamondGraduate-level science questions | — | 67.6% |
| OTIS Mock AIME 2024–2025Competition mathematics | 70.8% (best) | 37.8% |
| Price per million tokens | ||
| Input | $0.146 (best) | $0.275 |
| Output | $1.96 | $1.12 (best) |
| Cached input | — | — |
| Blended (3:1) | $0.60 | $0.486 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 2 providers | Median of 13 providers |
| Limits | ||
| Context window | 1,048,576 tokens (best) | 163,840 tokens |
| Max output | 65,536 tokens | 163,840 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | No |
| PDFs | Yes | No |
| Audio | Yes | No |
| Video | Yes | No |
| Reasoning | Yes | No |
| Tool calling | Yes | Yes |
| Structured output | No | No |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | — | — |
| API providers | 2 | 13 (best) |
| Released | May 20, 2025 | Mar 24, 2025 |
| Knowledge cutoff | 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 2.5 Flash Preview 05-20$5.39
- DeepSeek V3 0324$4.99
Which should you choose?
Which is better: Gemini 2.5 Flash Preview 05-20 or DeepSeek V3 0324?
Gemini 2.5 Flash Preview 05-20 is the better all-round choice, scoring 67/100 against DeepSeek V3 0324 (52). It leads on capability, inputs & features and context window. DeepSeek V3 0324 wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, Gemini 2.5 Flash Preview 05-20 or DeepSeek V3 0324?
DeepSeek V3 0324 is cheaper at $0.275 input / $1.12 output per million tokens (median across 13 API providers). 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 $0.486 per million tokens for DeepSeek V3 0324 versus $0.60 for Gemini 2.5 Flash Preview 05-20 (1.2× 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 DeepSeek V3 0324 135.9 (#128 of 165). Their confidence ranges do not overlap (139.3–142.9 vs 132.5–137.7), so the gap is a real one. On individual benchmarks: OTIS Mock AIME 2024–2025 — Gemini 2.5 Flash Preview 05-20 70.8%, DeepSeek V3 0324 37.8%.
Which is better for coding?
There are no published SWE-bench Verified results for Gemini 2.5 Flash Preview 05-20 and DeepSeek V3 0324 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 2.5 Flash Preview 05-20 has the largest context window at 1,048,576 tokens, against 163,840 for DeepSeek V3 0324. Maximum output per response: Gemini 2.5 Flash Preview 05-20 up to 65,536, DeepSeek V3 0324 up to 163,840 tokens.
Which can read images, PDFs, audio or video?
Gemini 2.5 Flash Preview 05-20 accepts text, images, PDFs, audio and video; DeepSeek V3 0324 accepts text. Gemini 2.5 Flash Preview 05-20 handles the widest range of inputs.
Are any of these open source?
DeepSeek V3 0324 publishes its weights and can be self-hosted; Gemini 2.5 Flash Preview 05-20 is proprietary.
Which is newer?
Gemini 2.5 Flash Preview 05-20 is the newest, released May 20, 2025. DeepSeek V3 0324 came out Mar 24, 2025. Knowledge cutoff: 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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