Which is cheaper, Claude Fable 5.1 and Kimi K3?

Kimi K3 has the lowest input price. Per 1M input tokens: Claude Fable 5.1 from $10.00 and Kimi K3 from $2.70.

Which has the larger context window, Claude Fable 5.1 and Kimi K3?

Kimi K3 has the largest context window: Claude Fable 5.1 1,000,000 tokens and Kimi K3 1,048,576 tokens.

Which is better for coding, Claude Fable 5.1 and Kimi K3?

Claude Fable 5.1 scores highest on the Artificial Analysis Coding Index: Claude Fable 5.1 79.1 and Kimi K3 76.2.

Which is smarter, Claude Fable 5.1 and Kimi K3?

Claude Fable 5.1 scores highest on the Artificial Analysis Intelligence Index: Claude Fable 5.1 51.2 and Kimi K3 43.6.

Can I switch between Claude Fable 5.1 and Kimi K3 without changing my code?

Yes. All of them are served through FastRouter's OpenAI-compatible API, so switching is a change of the model parameter (anthropic/claude-fable-5.1, moonshotai/kimi-k3).

Claude Fable 5.1 vs Kimi K3

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Claude Fable 5.1 Anthropicanthropic/claude-fable-5.1

Kimi K3 MoonshotAImoonshotai/kimi-k3

Creator

Anthropic

MoonshotAI

Released

Sep 1, 2026

Jul 16, 2026

Context window

1.05M

Max output

128K

1.05M

Input / 1MLowest provider price

$10.00

$2.70$2.70–$3.00 across 4

Output / 1MLowest provider price

$50.00

$13.50$13.50–$15.00 across 4

Providers

IntelligenceArtificial Analysis index

51.2

43.6

CodingArtificial Analysis index

79.1

76.2

LatencyMedian time to first token

—

7.4s

ThroughputMedian tokens per second

—

<1 t/s

Accepts

Text, Image, Files

Text, Image

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

Claude Fable 5.1 vs Kimi K3: summary

Claude Fable 5.1 and Kimi K3 are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

Claude Fable 5.1, from Anthropic, has a 1,000,000-token context window, costs $10.00/1M input and $50.00/1M output tokens and scores 51.2 on the Artificial Analysis Intelligence Index.

Kimi K3, from MoonshotAI, has a 1,048,576-token context window, costs from $2.70/1M input and $13.50/1M output tokens across 4 providers and scores 43.6 on the Artificial Analysis Intelligence Index.

Kimi K3 is the cheapest on input, 3.7× cheaper than the next model, Kimi K3 has the largest context window, Claude Fable 5.1 scores highest for intelligence and Claude Fable 5.1 leads on coding.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="anthropic/claude-fable-5.1", messages=[...]) # or client.chat.completions.create(model="moonshotai/kimi-k3", messages=[...])

Full API docs

Frequently asked questions

More comparisons

Benchmark scores sourced from ArtificialAnalysis