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Comparison · 3 models · Updated Nov 2, 2026

Gemini 2.5 Flash vs Claude Haiku 4.5 vs Seed-OSS-36B-Instruct

Gemini 2.5 Flash comes out ahead, 84 to 61 and 40 on our weighted score, and it is the cheaper option too.

  1. Our pick

    Google

    Gemini 2.5 Flash

    Released Jun 17, 2025

    84/100
    • ECI140.6
    • Price$0.30 / $2.50
    • Context1.05M
    Full specs Remove Gemini 2.5 Flash

  2. Anthropic

    Claude Haiku 4.5

    Released Oct 15, 2025

    61/100
    • ECI142.2
    • Price$1.00 / $5.00
    • Context200K
    Full specs Remove Claude Haiku 4.5

  3. ByteDance Seed

    Seed-OSS-36B-Instruct

    Released Aug 20, 2025

    40/100
    • ECI—
    • Price—
    • Context524K
    Full specs Remove Seed-OSS-36B-Instruct
01 — Verdict

Gemini 2.5 Flash is our pick

Gemini 2.5 Flash is the better all-round choice, scoring 84/100 against Claude Haiku 4.5 (61) and Seed-OSS-36B-Instruct (40). It leads on inputs & features and context window. The score weighs inputs & features 60%, context window 40%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

  • CapabilityNot enough dataNo independent benchmark covers every model here yet
  • Lowest priceGemini 2.5 FlashGemini 2.5 Flash $0.85 · Claude Haiku 4.5 $2.00 per 1M tokens (3:1 blend) · Seed-OSS-36B-Instruct unpriced
  • Longest contextGemini 2.5 FlashGemini 2.5 Flash 1,048,576 · Seed-OSS-36B-Instruct 524,288 · Claude Haiku 4.5 200,000 tokens
  • Widest inputsGemini 2.5 FlashGemini 2.5 Flash: Text, Images, PDFs, Audio, Video · Claude Haiku 4.5: Text, Images, PDFs · Seed-OSS-36B-Instruct: Text
  • Self-hostingSeed-OSS-36B-InstructPublishes downloadable weights (Apache 2.0)
How the score is built
MeasureWeightGemini 2.5 FlashClaude Haiku 4.5Seed-OSS-36B-Instruct
Inputs & features60%1008035
Context window40%613249
Overall100%84/10061/10040/100

Left out because at least one model lacks the data: capability and price. The remaining weights were rescaled.

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 Claude Haiku 4.5 vs Seed-OSS-36B-Instruct specifications side by side
SpecificationGemini 2.5 FlashGoogleClaude Haiku 4.5AnthropicSeed-OSS-36B-InstructByteDance Seed
Capability
Capabilities Index (ECI)140.6142.2 (best)—
ECI rank#110 of 165#102 of 165 (best)—
GPQA DiamondGraduate-level science questions—71.2%71.5% (best)
OTIS Mock AIME 2024–2025Competition mathematics—66.7%67.5% (best)
SimpleQA VerifiedShort factual questions—13.2%—
Price per million tokens
Input$0.30 (best)$1.00—
Output$2.50 (best)$5.00—
Cached input$0.03 (best)$0.10—
Blended (3:1)$0.85 (best)$2.00—
Long-context rateSame rateSame rate—
Price sourceOfficial Google APIOfficial Anthropic API—
Limits
Context window1,048,576 tokens (best)200,000 tokens524,288 tokens
Max output65,536 tokens64,000 tokens524,288 tokens (best)
Inputs and features
TextYesYesYes
ImagesYesYesNo
PDFsYesYesNo
AudioYesNoNo
VideoYesNoNo
ReasoningYesYesYes
Tool callingYesYesYes
Structured outputYesYesNo
Availability
WeightsProprietaryProprietaryOpenApache 2.0
API model IDgemini-2.5-flashclaude-haiku-4-5—
API providers3248 (best)—
ReleasedJun 17, 2025Oct 15, 2025Aug 20, 2025
Knowledge cutoffJan 2025Feb 28, 2025Jul 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
  • Claude Haiku 4.5$20.00
  • Seed-OSS-36B-Instruct—
04 — Questions

Which should you choose?

Which is better: Gemini 2.5 Flash, Claude Haiku 4.5 or Seed-OSS-36B-Instruct?

Gemini 2.5 Flash is the better all-round choice, scoring 84/100 against Claude Haiku 4.5 (61) and Seed-OSS-36B-Instruct (40). It leads on inputs & features and context window. The score weighs inputs & features 60%, context window 40%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

Which is cheaper, Gemini 2.5 Flash, Claude Haiku 4.5 or Seed-OSS-36B-Instruct?

Gemini 2.5 Flash is cheaper at $0.30 input / $2.50 output per million tokens (official Google API price). Claude Haiku 4.5 costs $1.00 input / $5.00 output per million tokens (official Anthropic 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 $2.00 for Claude Haiku 4.5 (2.4× as much). Seed-OSS-36B-Instruct has no published per-token price.

Which scores higher on benchmarks?

There is no independent benchmark that covers all three models yet. Gemini 2.5 Flash has an ECI of 140.6, Claude Haiku 4.5 has an ECI of 142.2 and Seed-OSS-36B-Instruct has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Gemini 2.5 Flash, Claude Haiku 4.5 and Seed-OSS-36B-Instruct yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three 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 524,288 for Seed-OSS-36B-Instruct and 200,000 for Claude Haiku 4.5. Maximum output per response: Gemini 2.5 Flash up to 65,536, Claude Haiku 4.5 up to 64,000, Seed-OSS-36B-Instruct up to 524,288 tokens.

Which can read images, PDFs, audio or video?

Gemini 2.5 Flash accepts text, images, PDFs, audio and video; Claude Haiku 4.5 accepts text, images and PDFs; Seed-OSS-36B-Instruct accepts text. Gemini 2.5 Flash handles the widest range of inputs.

Are any of these open source?

Seed-OSS-36B-Instruct publishes its weights (Apache 2.0) and can be self-hosted; Gemini 2.5 Flash and Claude Haiku 4.5 is proprietary.

Which is newer?

Claude Haiku 4.5 is the newest, released Oct 15, 2025. Seed-OSS-36B-Instruct came out Aug 20, 2025; Gemini 2.5 Flash came out Jun 17, 2025. Knowledge cutoff: Gemini 2.5 Flash Jan 2025, Claude Haiku 4.5 Feb 28, 2025, Seed-OSS-36B-Instruct Jul 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 Nov 2, 2026.

05 — Keep comparing

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