AI model comparison
Claude Fable 5.1 vs Kimi K3
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Anthropic
Claude Fable 5.1
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual
- Input / 1M
- $10
- Output / 1M
- $50
- Context
- 1M
Moonshot AI
Kimi K3
Kimi K3 is a 2.8T parameter open-weight multimodal reasoning model from Moonshot AI.
- Input / 1M
- $0.90
- Output / 1M
- $14
- Context
- 1.05M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Kimi K3
5.1x cheaper for a typical chat
Higher intelligence score
Claude Fable 5.1
53.4 vs 43.6 on Artificial Analysis
Larger context window
Kimi K3
1.05M vs 1M tokens
Newer release
Claude Fable 5.1
Released September 1, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Fable 5.153.4Coding index
Claude Fable 5.181.6Agentic index
Claude Fable 5.157.9Pricing
Claude Fable 5.1 vs Kimi K3 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Fable 5.1 | |
|---|---|---|
| Input tokensPer 1M tokens | $10 | $0.90 |
| Output tokensPer 1M tokens | $50 | $14 |
| Cached input (read)Per 1M tokens | $0.25 | $0.60 |
| Cache writePer 1M tokens | $12.50 | Not available |
| Web searchPer request | $0.01 | Not available |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Claude Fable 5.1$45Coding task
30K in, 4K out
Claude Fable 5.1$500$207.50 cachedLong document summary
150K in, 2K out
Claude Fable 5.1$1600$137.50 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Claude Fable 5.1 | |
|---|---|---|
| Context window | 1M tokens | 1.05M tokens |
| Max output | 128K tokens | 944K tokens |
| Input types | File, Image, Text | Image, Text, Video |
| Output types | Text | Text |
| Reasoning effort levels | Max, Extra high, High, Medium, Low | Max, High, Low |
| Default reasoning effort | High | Max |
| Release date | September 1, 2026 | July 16, 2026 |
Features
Supported features
API features available for each model.
| Metric | Claude Fable 5.1 | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Not supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Not supported | Supported |
| Verbosity control | Supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Claude Fable 5.1View full model details- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Fable 5.1 vs Claude Sonnet 5.5
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Fable 5.1 vs GPT-6.1 Sol
- Claude Fable 5.1 vs Claude Opus 5
- Claude Fable 5.1 vs Claude Fable 5
- Claude Fable 5.1 vs Muse Spark 1.3
- Claude Fable 5.1 vs GPT-6 Sol
- Claude Fable 5.1 vs GPT-5.6 Sol
- Claude Fable 5.1 vs GLM 5.3 Flash
- Claude Fable 5.1 vs Claude Opus 4.8
- Claude Fable 5.1 vs DeepSeek V4.1 Flash
- Claude Fable 5.1 vs GPT-6 Luna
- Claude Fable 5.1 vs MiMo-V2.6-Flash
- Claude Fable 5.1 vs DeepSeek V4 Flash 0731
- Claude Fable 5.1 vs Hy4 preview
- Kimi K3 vs Claude Opus 5.5
- Kimi K3 vs GPT-6 Astra
- Kimi K3 vs GPT-6.1 Sol
- Kimi K3 vs Claude Opus 5
- Kimi K3 vs Claude Fable 5
- Kimi K3 vs GLM 5.3
- Kimi K3 vs GPT-6 Sol
- Kimi K3 vs GPT-5.6 Sol
- Kimi K3 vs Gemini 3.8 Flash
- Kimi K3 vs Grok 4.7
- Kimi K3 vs Qwen3.8 Max (0902)
- Kimi K3 vs Grok 4.6
- Kimi K3 vs Claude Haiku 5.5
- Kimi K3 vs GPT-5.6 Terra
- Kimi K3 vs Claude Opus 4.8
- Kimi K3 vs Ling 3.1 Flash
- Kimi K3 vs Claude Opus 4.7
- Kimi K3 vs Qwen3.8 2.4T A95B
- Kimi K3 vs GPT-5.4
- Kimi K3 vs Claude Sonnet 5
- Kimi K3 vs GPT-5.5
Our take
Kimi K3 is 5.1x cheaper for a typical chat. Claude Fable 5.1 scores higher on the Artificial Analysis Intelligence Index (53.4 vs 43.6). Kimi K3 has the larger context window (1.05M vs 1M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Claude Fable 5.1 or Kimi K3 cheaper?
Kimi K3 is cheaper for a typical chat (2K input tokens and 500 output tokens). Kimi K3 costs $0.90 per 1M input tokens and $14 per 1M output tokens, while Claude Fable 5.1 costs $10 per 1M input tokens and $50 per 1M output tokens.
Which has a bigger context window, Claude Fable 5.1 or Kimi K3?
Kimi K3 supports up to 1.05M tokens of context, compared with 1M for Claude Fable 5.1.
Is Claude Fable 5.1 smarter than Kimi K3?
On the Artificial Analysis Intelligence Index, Claude Fable 5.1 scores 53.4 and Kimi K3 scores 43.6, putting Claude Fable 5.1 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Claude Fable 5.1 and Kimi K3 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Claude Fable 5.1 and Kimi K3 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Claude Fable 5.1 and Kimi K3 at the same time. Compare the answers side by side and keep the best one.