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Comparison · 2 models · Updated Nov 2, 2026

Gemini 4 Argon vs Claude Fable 5.1

Gemini 4 Argon comes out ahead, 74 to 66 on our weighted score, and it is the cheaper option too.

  1. Our pick

    Google

    Gemini 4 Argon

    Released Oct 13, 2026New

    74/100
    • ECI166.1
    • Price$2.00 / $10.00
    • Context1.05M
    Full specs Remove Gemini 4 Argon

  2. Anthropic

    Claude Fable 5.1

    Released Sep 1, 2026

    66/100
    • ECI166.4
    • Price$10.00 / $50.00
    • Context1M
    Full specs Remove Claude Fable 5.1

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Gemini 4 Argon is our pick

Gemini 4 Argon is the better all-round choice, scoring 74/100 against Claude Fable 5.1 (66). It leads on price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityClaude Fable 5.1Capabilities Index (ECI): Claude Fable 5.1 166.4 · Gemini 4 Argon 166.1
  • Lowest priceGemini 4 ArgonGemini 4 Argon $4.00 · Claude Fable 5.1 $20.00 per 1M tokens (3:1 blend)
  • Longest contextGemini 4 ArgonGemini 4 Argon 1,048,576 · Claude Fable 5.1 1,000,000 tokens
  • Widest inputsGemini 4 ArgonGemini 4 Argon: Text, Images, PDFs, Audio, Video · Claude Fable 5.1: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGemini 4 ArgonClaude Fable 5.1
CapabilityCapabilities Index (ECI)50%9697
Price25%200
Inputs & features15%10080
Context window10%6160
Overall100%74/10066/100
02 — Side by side

Every spec in one table

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

Gemini 4 Argon vs Claude Fable 5.1 specifications side by side
SpecificationGemini 4 ArgonGoogleClaude Fable 5.1Anthropic
Capability
Capabilities Index (ECI)166.1166.4 (best)
ECI rank#7 of 165#6 of 165 (best)
GPQA DiamondGraduate-level science questions96.4%—
FrontierMath Tiers 1–3Research-level mathematics86.0%90.2% (best)
OTIS Mock AIME 2024–2025Competition mathematics100%100%
SimpleQA VerifiedShort factual questions76.0% (best)70.8%
Price per million tokens
Input$2.00 (best)$10.00
Output$10.00 (best)$50.00
Cached input$0.10 (best)$0.25
Blended (3:1)$4.00 (best)$20.00
Long-context rateSame rateSame rate
Price sourceOfficial Google APIOfficial Anthropic API
Limits
Context window1,048,576 tokens (best)1,000,000 tokens
Max output65,536 tokens128,000 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesYes
AudioYesNo
VideoYesNo
ReasoningYeslow · medium · highYeslow · medium · high · xhigh · max
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgemini-4-argonclaude-fable-5-1
API providers2437 (best)
ReleasedOct 13, 2026Sep 1, 2026
Knowledge cutoffMar 2026Jun 2026
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 4 Argon$40.00
  • Claude Fable 5.1$200.00
04 — Questions

Which should you choose?

Which is better: Gemini 4 Argon or Claude Fable 5.1?

Gemini 4 Argon is the better all-round choice, scoring 74/100 against Claude Fable 5.1 (66). It leads on price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Gemini 4 Argon or Claude Fable 5.1?

Gemini 4 Argon is cheaper at $2.00 input / $10.00 output per million tokens (official Google API price). Claude Fable 5.1 costs $10.00 input / $50.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $4.00 per million tokens for Gemini 4 Argon versus $20.00 for Claude Fable 5.1 (5× as much).

Which scores higher on benchmarks?

Claude Fable 5.1 scores higher on the Capabilities Index (ECI): Claude Fable 5.1 166.4 (#6 of 165) and Gemini 4 Argon 166.1 (#7 of 165). The confidence ranges of the top two overlap (163.6–170.8 vs 163.1–170.3), so treat the gap as small. On individual benchmarks: FrontierMath Tiers 1–3 — Claude Fable 5.1 90.2%, Gemini 4 Argon 86.0%; OTIS Mock AIME 2024–2025 — Gemini 4 Argon 100%, Claude Fable 5.1 100%; SimpleQA Verified — Gemini 4 Argon 76.0%, Claude Fable 5.1 70.8%.

Which is better for coding?

There are no published SWE-bench Verified results for Gemini 4 Argon and Claude Fable 5.1 yet, so there is no like-for-like coding score. On overall capability, Claude Fable 5.1 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 4 Argon has the largest context window at 1,048,576 tokens, against 1,000,000 for Claude Fable 5.1. Maximum output per response: Gemini 4 Argon up to 65,536, Claude Fable 5.1 up to 128,000 tokens.

Which can read images, PDFs, audio or video?

Gemini 4 Argon accepts text, images, PDFs, audio and video; Claude Fable 5.1 accepts text, images and PDFs. Gemini 4 Argon handles the widest range of inputs.

Are any of these open source?

No. Gemini 4 Argon and Claude Fable 5.1 are proprietary and only available through APIs and apps.

Which is newer?

Gemini 4 Argon is the newest, released Oct 13, 2026. Claude Fable 5.1 came out Sep 1, 2026. Knowledge cutoff: Gemini 4 Argon Mar 2026, Claude Fable 5.1 Jun 2026.

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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