Head-to-head · Anthropic vs Google
Claude Fable 5.1 vs Gemini 3.1 Pro
Quick answer: Claude Fable 5.1 stands out for highest quality ceiling in the generally available Claude lineup. Gemini 3.1 Pro stands out for strong multimodal coverage. Reviewed September 2026.
Overview
Claude Fable 5.1: Claude Fable 5.1 is Anthropic's premium generally available model, priced above Opus and built for the hardest reasoning, coding and analysis tasks. Anthropic says the cheaper Opus 5.5 now matches it on most work, so Fable 5.1 makes most sense where the last few points of quality justify the price.
Gemini 3.1 Pro: Gemini 3.1 Pro, released by Google in February 2026, is a multimodal model with strong agentic capabilities. It is listed at $2 and $12 per million tokens for prompts up to 200,000 tokens ($4 and $18 above that) and is offered in preview on the Gemini API.
At a glance
| Dimension | Claude Fable 5.1 | Gemini 3.1 Pro |
|---|---|---|
| Vendor | Anthropic | |
| Starting price | API: $10 in / $50 out per M tokens | API: $2 in / $12 out per M tokens |
| Pricing model | Paid | Paid |
| Free tier | No | No |
| Category | Generative AI | Generative AI |
Strengths and limits
Claude Fable 5.1
- Highest quality ceiling in the generally available Claude lineup
- Suited to long, high-stakes analysis
- Heavy prompt caching lowers cost for repeated context
Watch out for
- $10 input and $50 output per million tokens
- Opus 5.5 is comparable on most tasks at lower cost
- Not needed for routine work
Gemini 3.1 Pro
- Strong multimodal coverage
- Deep Google ecosystem integration
- Competitive price for a Pro-tier model
Watch out for
- Listed as a preview model on the pricing page
- Google has said Gemini 4 is coming
- Output style can vary between interfaces
Key features
Claude Fable 5.1
- 1M-token context window at standard pricing
- Top-tier reasoning and agentic performance
- Cache reads priced at a steep discount for repeated context
- Tool use and computer use
- Available through the Claude API and major clouds
Gemini 3.1 Pro
- Multimodal understanding across text, images, audio and video
- Agentic and tool-use capabilities
- Tiered pricing for prompts over 200,000 tokens
- Available through the Gemini API and Google Cloud
Pricing compared
Claude Fable 5.1 is priced by usage rather than by seat: API: $10 in / $50 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Gemini 3.1 Pro is priced by usage rather than by seat: API: $2 in / $12 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Frequently asked questions
Which is better, Claude Fable 5.1 or Gemini 3.1 Pro?
It depends on the work. Claude Fable 5.1 stands out for highest quality ceiling in the generally available Claude lineup. Gemini 3.1 Pro stands out for strong multimodal coverage.
How do Claude Fable 5.1 and Gemini 3.1 Pro compare on price?
Claude Fable 5.1 is priced by usage rather than by seat: API: $10 in / $50 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing. Gemini 3.1 Pro is priced by usage rather than by seat: API: $2 in / $12 out per M tokens. That means cost scales with how much text you send and receive, so estimate your monthly volume before committing.
Is there a free option between Claude Fable 5.1 and Gemini 3.1 Pro?
Neither lists a permanent free tier. Look for trials or usage-based pricing to test on real work first.