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Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model and a post-trained successor to Kimi K3, with a 1M-token context window.

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AuthorMoonshot
Country🇨🇳 China
ReleasedOct 23, 2026
Overview
Cost rate
2x
Context
1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$2.00
Cached input$0.20
Output$10.00
Context
Context length1,048,576
Max output tokens943,718
Knowledge cutoff-
Performance
Throughput29 tok/s
Latency2.75s

Claude Fable 5.1 is Anthropic's most capable model, released September 2026 as an upgrade to Claude Fable 5 for coding, knowledge work, and long-running problem-solving, with a 1M-token context window. It improves agentic coding by over 30% and doubles its predecessor's Terminal-Bench-Science score while cutting costs through cheaper cache reads, and is the openly available counterpart to the more tightly safeguarded Mythos 5.1.

Medicine & Healthcare#1Mathematical#2Document analysis#2Life, Physical, & Social Science#7
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AuthorAnthropic
Country🇺🇸 United States
ReleasedSep 1, 2026
Overview
Cost rate
10x
Context
1M
Input
Output
Reasoning
Tool calling
Structured outputs
Pricing/M tokens
Input$10.00
Cached input$0.25
Output$50.00
Context
Context length1,000,000
Max output tokens128,000
Knowledge cutoff-
Performance
Throughput57 tok/s
Latency22.36s

Benchmarks

Head-to-head scores across reasoning, coding, and agentic indices, plus per-domain rankings.

Intelligence

64.6
Claude Fable 5.2 (Max, Default Fallback)
59.1
Claude Opus 5.5 (Max, Default Fallback)
56.9
GPT-6 Astra (Max)
54.6
GPT-6.1 Sol (Max)
46.5
Kimi K3.1 Pro
38.7
Claude Fable 5.1

Coding

80.7
Claude Fable 5.1
78.3
GPT-5.6 Sol
78.0
Claude Opus 5
76.9
GPT-6 Astra
76.7
GPT-5.6 Terra
76.5
Claude Fable 5

Kimi K3.1 Pro has no data

Automation & Tool Use

57.2
Claude Fable 5.1
56.5
Claude Opus 5
56.0
Qwen3.8 Max (0902)
55.5
Muse Spark 1.3
53.1
GLM 5.3
52.5
Grok 4.6

Kimi K3.1 Pro has no data

Intelligence, coding & agentic scores from Artificial Analysis.

Software & IT Services

arena.ai
1548
Gemini 4 Argon (High)
1542
Muse Wonder (Max)
1540
Claude Opus 4.7 (High)
1538
Claude Fable 5 (High)
1537
Claude Opus 4.6 (High)
1533
Claude Opus 5.5 (High)
1533
Muse Spark 1.2 (xHigh)
1530
GPT-6.1 Sol (Max)
1528
MiMo V2.6 Pro
1525
Claude Fable 5.1

Kimi K3.1 Pro has no data

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