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Comparison · 3 models · Updated Oct 4, 2026

Claude Fable 5 vs Gemini 3.1 Pro Preview vs GPT-5.4 Pro

Gemini 3.1 Pro Preview comes out ahead, 68 to 65 and 60 on our weighted score, and it is the cheaper option too.

  1. Anthropic

    Claude Fable 5

    Released Jun 9, 2026

    65/100
    • ECI162.2
    • Price$10.00 / $50.00
    • Context1M
    Full specs Remove Claude Fable 5
  2. Our pick

    Google

    Gemini 3.1 Pro Preview

    Released Feb 19, 2026

    68/100
    • ECI154.8
    • Price$2.00 / $12.00
    • Context1.05M
    Full specs Remove Gemini 3.1 Pro Preview

  3. OpenAI

    GPT-5.4 Pro

    Released Mar 5, 2026

    60/100
    • ECI159.1
    • Price$30.00 / $180.00
    • Context1.05M
    Full specs Remove GPT-5.4 Pro
01 — Verdict

Gemini 3.1 Pro Preview is our pick

Gemini 3.1 Pro Preview is the better all-round choice, scoring 68/100 against Claude Fable 5 (65) and GPT-5.4 Pro (60). It leads on price and inputs & features. Claude Fable 5 wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityClaude Fable 5Capabilities Index (ECI): Claude Fable 5 162.2 · GPT-5.4 Pro 159.1 · Gemini 3.1 Pro Preview 154.8
  • Lowest priceGemini 3.1 Pro PreviewGemini 3.1 Pro Preview $4.50 · Claude Fable 5 $20.00 · GPT-5.4 Pro $67.50 per 1M tokens (3:1 blend)
  • Longest contextGPT-5.4 Pro and Gemini 3.1 Pro PreviewGPT-5.4 Pro 1,050,000 · Gemini 3.1 Pro Preview 1,048,576 · Claude Fable 5 1,000,000 tokens
  • Widest inputsGemini 3.1 Pro PreviewClaude Fable 5: Text, Images, PDFs · Gemini 3.1 Pro Preview: Text, Images, PDFs, Audio, Video · GPT-5.4 Pro: Text, Images
  • Self-hostingNo open weightsAll three are available only through APIs
How the score is built
MeasureWeightClaude Fable 5Gemini 3.1 Pro PreviewGPT-5.4 Pro
CapabilityCapabilities Index (ECI)50%948490
Price25%0190
Inputs & features15%8010060
Context window10%606161
Overall100%65/10068/10060/100
02 — Side by side

Every spec in one table

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

Claude Fable 5 vs Gemini 3.1 Pro Preview vs GPT-5.4 Pro specifications side by side
SpecificationClaude Fable 5AnthropicGemini 3.1 Pro PreviewGoogleGPT-5.4 ProOpenAI
Capability
Capabilities Index (ECI)162.2 (best)154.8159.1
ECI rank#7 of 148 (best)#31 of 148#11 of 148
GPQA DiamondGraduate-level science questions85.9%94.4%94.6% (best)
FrontierMath Tiers 1–3Research-level mathematics87.0% (best)59.7%82.5%
OTIS Mock AIME 2024–2025Competition mathematics100% (best)95.6%—
SWE-bench VerifiedFixing real GitHub issues—75.6%—
SimpleQA VerifiedShort factual questions70.7%73.5% (best)46.3%
Price per million tokens
Input$10.00$2.00 (best)$30.00
Output$50.00$12.00 (best)$180.00
Cached input$1.00$0.20 (best)—
Blended (3:1)$20.00$4.50 (best)$67.50
Long-context rateSame rateOver 200K: $4.00 / $18.00Over 272K: $60.00 / $270.00
Price sourceOfficial Anthropic APIOfficial Google APIOfficial OpenAI API
Limits
Context window1,000,000 tokens1,048,576 tokens1,050,000 tokens (best)
Max output128,000 tokens (best)65,536 tokens128,000 tokens (best)
Inputs and features
TextYesYesYes
ImagesYesYesYes
PDFsYesYesNo
AudioNoYesNo
VideoNoYesNo
ReasoningYeslow · medium · high · xhigh · maxYeslow · medium · highYesmedium · high · xhigh
Tool callingYesYesYes
Structured outputYesYesNo
Availability
WeightsProprietaryProprietaryProprietary
API model IDclaude-fable-5gemini-3.1-pro-previewgpt-5.4-pro
API providers38 (best)2616
ReleasedJun 9, 2026Feb 19, 2026Mar 5, 2026
Knowledge cutoffJan 31, 2026Jan 2025Aug 31, 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.

  • Claude Fable 5$200.00
  • Gemini 3.1 Pro Preview$44.00
  • GPT-5.4 Pro$660.00
04 — Questions

Which should you choose?

Which is better: Claude Fable 5, Gemini 3.1 Pro Preview or GPT-5.4 Pro?

Gemini 3.1 Pro Preview is the better all-round choice, scoring 68/100 against Claude Fable 5 (65) and GPT-5.4 Pro (60). It leads on price and inputs & features. Claude Fable 5 wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Claude Fable 5, Gemini 3.1 Pro Preview or GPT-5.4 Pro?

Gemini 3.1 Pro Preview is cheaper at $2.00 input / $12.00 output per million tokens (official Google API price). Claude Fable 5 costs $10.00 input / $50.00 output per million tokens (official Anthropic API price); GPT-5.4 Pro costs $30.00 input / $180.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $4.50 per million tokens for Gemini 3.1 Pro Preview versus $20.00 for Claude Fable 5 (4.4× as much) and $67.50 for GPT-5.4 Pro (15× as much).

Which scores higher on benchmarks?

Claude Fable 5 scores higher on the Capabilities Index (ECI): Claude Fable 5 162.2 (#7 of 148), GPT-5.4 Pro 159.1 (#11 of 148) and Gemini 3.1 Pro Preview 154.8 (#31 of 148). The confidence ranges of the top two overlap (159.6–166.1 vs 156.5–161.9), so treat the gap as small. On individual benchmarks: GPQA Diamond — GPT-5.4 Pro 94.6%, Gemini 3.1 Pro Preview 94.4%, Claude Fable 5 85.9%; FrontierMath Tiers 1–3 — Claude Fable 5 87.0%, GPT-5.4 Pro 82.5%, Gemini 3.1 Pro Preview 59.7%; SimpleQA Verified — Gemini 3.1 Pro Preview 73.5%, Claude Fable 5 70.7%, GPT-5.4 Pro 46.3%.

Which is better for coding?

There are no published SWE-bench Verified results for Claude Fable 5 and GPT-5.4 Pro yet, so there is no like-for-like coding score. On overall capability, Claude Fable 5 leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.

Which has the bigger context window?

GPT-5.4 Pro and Gemini 3.1 Pro Preview have the largest context windows (1,050,000 and 1,048,576 tokens), against 1,000,000 for Claude Fable 5. Maximum output per response: Claude Fable 5 up to 128,000, Gemini 3.1 Pro Preview up to 65,536, GPT-5.4 Pro up to 128,000 tokens.

Which can read images, PDFs, audio or video?

Claude Fable 5 accepts text, images and PDFs; Gemini 3.1 Pro Preview accepts text, images, PDFs, audio and video; GPT-5.4 Pro accepts text and images. Gemini 3.1 Pro Preview handles the widest range of inputs.

Are any of these open source?

No. Claude Fable 5, Gemini 3.1 Pro Preview and GPT-5.4 Pro are proprietary and only available through APIs and apps.

Which is newer?

Claude Fable 5 is the newest, released Jun 9, 2026. GPT-5.4 Pro came out Mar 5, 2026; Gemini 3.1 Pro Preview came out Feb 19, 2026. Knowledge cutoff: Claude Fable 5 Jan 31, 2026, Gemini 3.1 Pro Preview Jan 2025, GPT-5.4 Pro Aug 31, 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 Oct 4, 2026.

05 — Keep comparing

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