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Comparison · 2 models · Updated Oct 4, 2026

Gemini 2.5 Flash vs GPT-5 Mini

Too close to call on our weighted score (Gemini 2.5 Flash 68, GPT-5 Mini 65). The right pick depends on what you value most.

  1. Google

    Gemini 2.5 Flash

    Released Jun 17, 2025

    68/100
    • ECI140.8
    • Price$0.30 / $2.50
    • Context1.05M
    Full specs Remove Gemini 2.5 Flash

  2. OpenAI

    GPT-5 Mini

    Released Aug 7, 2025

    65/100
    • ECI145.5
    • Price$0.25 / $2.00
    • Context400K
    Full specs Remove GPT-5 Mini

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01 — Verdict

Too close to call

It is close. Our weighted score puts them within 2 points (Gemini 2.5 Flash 68/100, GPT-5 Mini 65/100), so choose by what matters most for your work: GPT-5 Mini for raw capability and Gemini 2.5 Flash for long inputs. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT-5 MiniCapabilities Index (ECI): GPT-5 Mini 145.5 · Gemini 2.5 Flash 140.8
  • Lowest priceGPT-5 MiniGPT-5 Mini $0.688 · Gemini 2.5 Flash $0.85 per 1M tokens (3:1 blend)
  • Longest contextGemini 2.5 FlashGemini 2.5 Flash 1,048,576 · GPT-5 Mini 400,000 tokens
  • Widest inputsGemini 2.5 FlashGemini 2.5 Flash: Text, Images, PDFs, Audio, Video · GPT-5 Mini: Text, Images
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGemini 2.5 FlashGPT-5 Mini
CapabilityCapabilities Index (ECI)50%6772
Price25%5358
Inputs & features15%10070
Context window10%6144
Overall100%68/10065/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Gemini 2.5 Flash vs GPT-5 Mini specifications side by side
SpecificationGemini 2.5 FlashGoogleGPT-5 MiniOpenAI
Capability
Capabilities Index (ECI)140.8145.5 (best)
ECI rank#97 of 148#77 of 148 (best)
GPQA DiamondGraduate-level science questions—75.0%
FrontierMath Tiers 1–3Research-level mathematics—46.7%
OTIS Mock AIME 2024–2025Competition mathematics—86.7%
SWE-bench VerifiedFixing real GitHub issues—64.7%
SimpleQA VerifiedShort factual questions—21.6%
Price per million tokens
Input$0.30$0.25 (best)
Output$2.50$2.00 (best)
Cached input$0.03$0.025 (best)
Blended (3:1)$0.85$0.688 (best)
Long-context rateSame rateSame rate
Price sourceOfficial Google APIOfficial OpenAI API
Limits
Context window1,048,576 tokens (best)400,000 tokens
Max output65,536 tokens128,000 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesNo
AudioYesNo
VideoYesNo
ReasoningYesYesminimal · low · medium · high
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgemini-2.5-flashgpt-5-mini
API providers2223 (best)
ReleasedJun 17, 2025Aug 7, 2025
Knowledge cutoffJan 2025May 30, 2024
03 — Cost

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$8.00
  • GPT-5 Mini$6.50
04 — Questions

Which should you choose?

Which is better: Gemini 2.5 Flash or GPT-5 Mini?

It is close. Our weighted score puts them within 2 points (Gemini 2.5 Flash 68/100, GPT-5 Mini 65/100), so choose by what matters most for your work: GPT-5 Mini for raw capability and Gemini 2.5 Flash for long inputs. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Gemini 2.5 Flash or GPT-5 Mini?

GPT-5 Mini is cheaper at $0.25 input / $2.00 output per million tokens (official OpenAI API price). Gemini 2.5 Flash costs $0.30 input / $2.50 output per million tokens (official Google API price). At a typical mix of three input tokens to one output token, that is $0.688 per million tokens for GPT-5 Mini versus $0.85 for Gemini 2.5 Flash (1.2× as much).

Which scores higher on benchmarks?

GPT-5 Mini scores higher on the Capabilities Index (ECI): GPT-5 Mini 145.5 (#77 of 148) and Gemini 2.5 Flash 140.8 (#97 of 148). Their confidence ranges do not overlap (143.6–147.0 vs 138.5–142.3), so the gap is a real one.

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, GPT-5 Mini 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 has the largest context window at 1,048,576 tokens, against 400,000 for GPT-5 Mini. Maximum output per response: Gemini 2.5 Flash up to 65,536, GPT-5 Mini up to 128,000 tokens.

Which can read images, PDFs, audio or video?

Gemini 2.5 Flash accepts text, images, PDFs, audio and video; GPT-5 Mini accepts text and images. Gemini 2.5 Flash handles the widest range of inputs.

Are any of these open source?

No. Gemini 2.5 Flash and GPT-5 Mini are proprietary and only available through APIs and apps.

Which is newer?

GPT-5 Mini is the newest, released Aug 7, 2025. Gemini 2.5 Flash came out Jun 17, 2025. Knowledge cutoff: Gemini 2.5 Flash Jan 2025, GPT-5 Mini May 30, 2024.

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.

05 — Keep comparing

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