GPT-4.1 vs Gemini 2.5 Flash
Gemini 2.5 Flash comes out ahead, 66 to 52 on our weighted score, and it is the cheaper option too.
OpenAIGPT-4.1
52/100- ECI136.7
- Price$2.00 / $8.00
- Context1.05M
- Our pick
GoogleGemini 2.5 Flash
66/100- ECI140.6
- Price$0.30 / $2.50
- Context1.05M
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Gemini 2.5 Flash is our pick
Gemini 2.5 Flash is the better all-round choice, scoring 66/100 against GPT-4.1 (52). It leads on capability, price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityGemini 2.5 FlashCapabilities Index (ECI): Gemini 2.5 Flash 140.6 · GPT-4.1 136.7
- Lowest priceGemini 2.5 FlashGemini 2.5 Flash $0.85 · GPT-4.1 $3.50 per 1M tokens (3:1 blend)
- Longest contextAbout the sameGemini 2.5 Flash 1,048,576 · GPT-4.1 1,047,576 tokens
- Widest inputsGemini 2.5 FlashGPT-4.1: Text, Images, PDFs · Gemini 2.5 Flash: Text, Images, PDFs, Audio, Video
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | GPT-4.1 | Gemini 2.5 Flash |
|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 60 | 65 |
| Price | 25% | 23 | 51 |
| Inputs & features | 15% | 70 | 100 |
| Context window | 10% | 61 | 61 |
| Overall | 100% | 52/100 | 66/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-4.1OpenAI | Gemini 2.5 FlashGoogle |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 136.7 | 140.6 (best) |
| ECI rank | #125 of 165 | #110 of 165 (best) |
| GPQA DiamondGraduate-level science questions | 66.9% | — |
| FrontierMath Tiers 1–3Research-level mathematics | 6.0% | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 38.3% | — |
| SWE-bench VerifiedFixing real GitHub issues | 48.5% | — |
| SimpleQA VerifiedShort factual questions | 31.1% | — |
| Price per million tokens | ||
| Input | $2.00 | $0.30 (best) |
| Output | $8.00 | $2.50 (best) |
| Cached input | $0.50 | $0.03 (best) |
| Blended (3:1) | $3.50 | $0.85 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official OpenAI API | Official Google API |
| Limits | ||
| Context window | 1,047,576 tokens | 1,048,576 tokens (best) |
| Max output | 32,768 tokens | 65,536 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | Yes | Yes |
| Audio | No | Yes |
| Video | No | Yes |
| Reasoning | No | Yes |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | gpt-4.1 | gemini-2.5-flash |
| API providers | 31 | 32 (best) |
| Released | Apr 14, 2025 | Jun 17, 2025 |
| Knowledge cutoff | Apr 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.
- GPT-4.1$36.00
- Gemini 2.5 Flash$8.00
Which should you choose?
Which is better: GPT-4.1 or Gemini 2.5 Flash?
Gemini 2.5 Flash is the better all-round choice, scoring 66/100 against GPT-4.1 (52). It leads on capability, price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, GPT-4.1 or Gemini 2.5 Flash?
Gemini 2.5 Flash is cheaper at $0.30 input / $2.50 output per million tokens (official Google API price). GPT-4.1 costs $2.00 input / $8.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.85 per million tokens for Gemini 2.5 Flash versus $3.50 for GPT-4.1 (4.1× as much).
Which scores higher on benchmarks?
Gemini 2.5 Flash scores higher on the Capabilities Index (ECI): Gemini 2.5 Flash 140.6 (#110 of 165) and GPT-4.1 136.7 (#125 of 165). The confidence ranges of the top two overlap (138.4–142.1 vs 134.0–138.5), so treat the gap as small.
Which is better for coding?
There are no published SWE-bench Verified results for Gemini 2.5 Flash yet, so there is no like-for-like coding score. On overall capability, Gemini 2.5 Flash 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?
Their context windows are effectively the same size: GPT-4.1 1,047,576 and Gemini 2.5 Flash 1,048,576 tokens. Maximum output per response: GPT-4.1 up to 32,768, Gemini 2.5 Flash up to 65,536 tokens.
Which can read images, PDFs, audio or video?
GPT-4.1 accepts text, images and PDFs; Gemini 2.5 Flash accepts text, images, PDFs, audio and video. Gemini 2.5 Flash handles the widest range of inputs.
Are any of these open source?
No. GPT-4.1 and Gemini 2.5 Flash are proprietary and only available through APIs and apps.
Which is newer?
Gemini 2.5 Flash is the newest, released Jun 17, 2025. GPT-4.1 came out Apr 14, 2025. Knowledge cutoff: GPT-4.1 Apr 2024, Gemini 2.5 Flash 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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