ZMIME
Comparison · 2 models · Updated Oct 4, 2026

Claude Sonnet 4 vs Claude Sonnet 3.7

Too close to call on our weighted score (Claude Sonnet 4 51, Claude Sonnet 3.7 50). The right pick depends on what you value most.

  1. Anthropic

    Claude Sonnet 4

    Released May 22, 2025

    51/100
    • ECI141.7
    • Price$3.00 / $15.00
    • Context200K
    Full specs Remove Claude Sonnet 4

  2. Anthropic

    Claude Sonnet 3.7

    Released Feb 19, 2025

    50/100
    • ECI141.2
    • Price$3.00 / $15.00
    • Context200K
    Full specs Remove Claude Sonnet 3.7

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01 — Verdict

Too close to call

It is close. Our weighted score puts them within a point (Claude Sonnet 4 51/100, Claude Sonnet 3.7 50/100), so choose by what matters most for your work: Claude Sonnet 4 for raw capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityClaude Sonnet 4Capabilities Index (ECI): Claude Sonnet 4 141.7 · Claude Sonnet 3.7 141.2
  • Lowest priceSame priceClaude Sonnet 4 $6.00 · Claude Sonnet 3.7 $6.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameClaude Sonnet 4 200,000 · Claude Sonnet 3.7 200,000 tokens
  • Widest inputsSame inputsClaude Sonnet 4: Text, Images, PDFs · Claude Sonnet 3.7: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightClaude Sonnet 4Claude Sonnet 3.7
CapabilityCapabilities Index (ECI)50%6867
Price25%1313
Inputs & features15%7070
Context window10%3232
Overall100%51/10050/100
02 — Side by side

Every spec in one table

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

Claude Sonnet 4 vs Claude Sonnet 3.7 specifications side by side
SpecificationClaude Sonnet 4AnthropicClaude Sonnet 3.7Anthropic
Capability
Capabilities Index (ECI)141.7 (best)141.2
ECI rank#94 of 148 (best)#96 of 148
GPQA DiamondGraduate-level science questions79.2%79.7% (best)
OTIS Mock AIME 2024–2025Competition mathematics71.1% (best)57.8%
SWE-bench VerifiedFixing real GitHub issues—61.0%
Price per million tokens
Input$3.00$3.00
Output$15.00$15.00
Cached input——
Blended (3:1)$6.00$6.00
Long-context rateSame rateSame rate
Price sourceMedian of 9 providersMedian of 3 providers
Limits
Context window200,000 tokens200,000 tokens
Max output64,000 tokens64,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesYes
AudioNoNo
VideoNoNo
ReasoningYesYes
Tool callingYesYes
Structured outputNoNo
Availability
WeightsProprietaryProprietary
API model ID——
API providers9 (best)3
ReleasedMay 22, 2025Feb 19, 2025
Knowledge cutoffMar 31, 2025Oct 31, 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.

  • Claude Sonnet 4$60.00
  • Claude Sonnet 3.7$60.00
04 — Questions

Which should you choose?

Which is better: Claude Sonnet 4 or Claude Sonnet 3.7?

It is close. Our weighted score puts them within a point (Claude Sonnet 4 51/100, Claude Sonnet 3.7 50/100), so choose by what matters most for your work: Claude Sonnet 4 for raw capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Claude Sonnet 4 or Claude Sonnet 3.7?

Claude Sonnet 4 and Claude Sonnet 3.7 cost the same: $3.00 input / $15.00 output per million tokens.

Which scores higher on benchmarks?

Claude Sonnet 4 scores higher on the Capabilities Index (ECI): Claude Sonnet 4 141.7 (#94 of 148) and Claude Sonnet 3.7 141.2 (#96 of 148). The confidence ranges of the top two overlap (139.2–142.9 vs 138.7–142.9), so treat the gap as small. On individual benchmarks: GPQA Diamond — Claude Sonnet 3.7 79.7%, Claude Sonnet 4 79.2%; OTIS Mock AIME 2024–2025 — Claude Sonnet 4 71.1%, Claude Sonnet 3.7 57.8%.

Which is better for coding?

There are no published SWE-bench Verified results for Claude Sonnet 4 yet, so there is no like-for-like coding score. On overall capability, Claude Sonnet 4 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?

Claude Sonnet 4 and Claude Sonnet 3.7 share the same 200,000-token context window. Maximum output per response: Claude Sonnet 4 up to 64,000, Claude Sonnet 3.7 up to 64,000 tokens.

Which can read images, PDFs, audio or video?

Claude Sonnet 4 accepts text, images and PDFs; Claude Sonnet 3.7 accepts text, images and PDFs. They handle the same number of input types.

Are any of these open source?

No. Claude Sonnet 4 and Claude Sonnet 3.7 are proprietary and only available through APIs and apps.

Which is newer?

Claude Sonnet 4 is the newest, released May 22, 2025. Claude Sonnet 3.7 came out Feb 19, 2025. Knowledge cutoff: Claude Sonnet 4 Mar 31, 2025, Claude Sonnet 3.7 Oct 31, 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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