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Claude Fable 5.1 🚀 Most Capable Overall

by Anthropic · Text & Chat · Code

Anthropic's most capable model overall · doubles Terminal-Bench (52.6%) · always-on adaptive thinking · SWE-bench Pro 81.2%.

99/100AIVerso score
#1 of 49in Text & Chat
$10/$50 per 1M tokensStarting price
NoFree tier
🔗 Try Claude Fable 5.1 →Compare with alternatives →

🔗 Affiliate link — we may earn a commission if you sign up, at no extra cost to you.

At a glance

ProviderAnthropic
CategoryText & Chat, Code
Starting price$10/$50 per 1M tokens
Free tierNo
API accessYes
Open sourceNo
Context window1M tokens
Mobile appiOS & Android

Key facts

Capability ratings

Math & Logice.g. AIME, MATH-500
96
Programminge.g. SWE-bench, LiveCodeBench
95
Reasoninge.g. GPQA, ARC
94
Knowledgee.g. MMLU-Pro
91
Long Contexte.g. MRCR, needle tests
96
Instruction Followinge.g. IFEval
95
Agent Capabilitye.g. Terminal-Bench, tool use
95

AIVerso capability ratings (0–100), an editorial summary informed by public benchmark results. Higher is better.

Features

✗ Image generation
✗ Video generation
✗ Native audio model
✓ Web search
✓ Voice mode (app)
✓ PDF analysis

Strengths

Top 3 of 49 AI chatbots & text models on AIVerso (#1)
Top-tier AIVerso score (99/100)
Large 1M token context window
Built-in web search
API access for developers
iOS & Android apps

Limitations

No free tier
Closed model — cannot be self-hosted

Best alternatives to Claude Fable 5.1

GPT-6 Astra
OpenAI · From $20/mo (Plus) — Score 98/100
Claude Fable 5.1 vs GPT-6 Astra →
98
Fugu Ultra v2
Sakana AI · $5/$30 per 1M tokens — Lower API price ($5/$30 per 1M tokens vs $10/$50 per 1M tokens)
97
Gemini 3.1 Pro
Google · Free – $20/mo · free tier — Has a free tier
96
MiMo-V2.6-Pro
Xiaomi · Free (open weights) · $0.44/$0.87 per 1M · free tier — Has a free tier
96
Kimi K3
Moonshot AI · Free – API · free tier — Has a free tier
96

🔗 Comparisons & guides

Claude Fable 5.1 vs GPT-6 AstraHead-to-head comparison
Claude Opus 5.5 vs Claude Fable 5.1Head-to-head comparison
Best AI Chatbot 2026: Top 7 AI Assistants RankedBest-of guide
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❓ Frequently Asked Questions

Is Claude Fable 5.1 free?

No, Claude Fable 5.1 has no free tier. Pricing: $10/$50 per 1M tokens.

What are the best alternatives to Claude Fable 5.1?

The highest-rated AI chatbots & text models from other providers on AIVerso are GPT-6 Astra (98/100), Fugu Ultra v2 (97/100), Gemini 3.1 Pro (96/100).

Does Claude Fable 5.1 have an API?

Yes, Claude Fable 5.1 can be used via an API.

Is Claude Fable 5.1 open source?

No, Claude Fable 5.1 is a closed, proprietary model from Anthropic.

How does AIVerso rate Claude Fable 5.1?

Claude Fable 5.1 scores 99/100 on AIVerso and ranks #1 of 49 in Text & Chat. Scores combine public benchmark results, features and pricing; commissions never influence them.

How we rate: Scores and capability ratings are based on public benchmarks, provider documentation, features and pricing — not on commission rates. Prices can change; check the provider's site before buying. Last updated: September 29, 2026.