ZMIME
Comparison · 2 models · Updated Nov 2, 2026

GPT-5 Mini vs Gemini 2.5 Flash

Too close to call on our weighted score (Gemini 2.5 Flash 66, GPT-5 Mini 64). The right pick depends on what you value most.

  1. OpenAI

    GPT-5 Mini

    Released Aug 7, 2025

    64/100
    • ECI145.4
    • Price$0.25 / $2.00
    • Context400K
    Full specs Remove GPT-5 Mini

  2. Google

    Gemini 2.5 Flash

    Released Jun 17, 2025

    66/100
    • ECI140.6
    • Price$0.30 / $2.50
    • Context1.05M
    Full specs Remove Gemini 2.5 Flash

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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 66/100, GPT-5 Mini 64/100), 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 145.4 · Gemini 2.5 Flash 140.6
  • 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 FlashGPT-5 Mini: Text, Images · Gemini 2.5 Flash: Text, Images, PDFs, Audio, Video
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGPT-5 MiniGemini 2.5 Flash
CapabilityCapabilities Index (ECI)50%7165
Price25%5551
Inputs & features15%70100
Context window10%4461
Overall100%64/10066/100
02 — Side by side

Every spec in one table

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

GPT-5 Mini vs Gemini 2.5 Flash specifications side by side
SpecificationGPT-5 MiniOpenAIGemini 2.5 FlashGoogle
Capability
Capabilities Index (ECI)145.4 (best)140.6
ECI rank#87 of 165 (best)#110 of 165
GPQA DiamondGraduate-level science questions75.0%—
FrontierMath Tiers 1–3Research-level mathematics46.7%—
OTIS Mock AIME 2024–2025Competition mathematics86.7%—
SWE-bench VerifiedFixing real GitHub issues64.7%—
SimpleQA VerifiedShort factual questions21.6%—
Price per million tokens
Input$0.25 (best)$0.30
Output$2.00 (best)$2.50
Cached input$0.025 (best)$0.03
Blended (3:1)$0.688 (best)$0.85
Long-context rateSame rateSame rate
Price sourceOfficial OpenAI APIOfficial Google API
Limits
Context window400,000 tokens1,048,576 tokens (best)
Max output128,000 tokens (best)65,536 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoYes
VideoNoYes
ReasoningYesminimal · low · medium · highYes
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgpt-5-minigemini-2.5-flash
API providers35 (best)32
ReleasedAug 7, 2025Jun 17, 2025
Knowledge cutoffMay 30, 2024Jan 2025
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.

  • GPT-5 Mini$6.50
  • Gemini 2.5 Flash$8.00
04 — Questions

Which should you choose?

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

It is close. Our weighted score puts them within 2 points (Gemini 2.5 Flash 66/100, GPT-5 Mini 64/100), 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, GPT-5 Mini or Gemini 2.5 Flash?

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 145.4 (#87 of 165) and Gemini 2.5 Flash 140.6 (#110 of 165). Their confidence ranges do not overlap (143.5–147.1 vs 138.4–142.1), 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: GPT-5 Mini up to 128,000, Gemini 2.5 Flash up to 65,536 tokens.

Which can read images, PDFs, audio or video?

GPT-5 Mini accepts text and images; 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-5 Mini and Gemini 2.5 Flash 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: GPT-5 Mini May 30, 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.

05 — Keep comparing

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