Claude Fable 5.1 vs Claude Sonnet 4.5

Claude Fable 5.1 (Anthropic) versus Claude Sonnet 4.5 (Anthropic): API pricing, context window, capabilities and uptime, from the same data as each model page, at the WandAPI default channel price. Input costs 6 Credits / M for Claude Fable 5.1 and 1.8 Credits / M for Claude Sonnet 4.5, so Claude Sonnet 4.5 is 70% cheaper. Context windows are 1M and 200K.

Claude Fable 5.1claude-fable-5-1
Anthropic
Input (prompt)
6Credits / M
≈ $0.917
Output (completion)
30Credits / M
≈ $4.58
1M context · 128K output91% off
Claude Fable 5.1 details
Claude Sonnet 4.5claude-sonnet-4-5-20250929
Anthropic
Input (prompt)
1.8Credits / M
≈ $0.275
Output (completion)
9Credits / M
≈ $1.38
200K context · 64K output91% off
Claude Sonnet 4.5 details
Lower input price
Claude Sonnet 4.5
70% cheaper
Larger context
Claude Fable 5.1
1M · 200K
More exclusive capabilities
Claude Fable 5.1
Response Schema, Web Search

Specs side by side

Item
Claude Fable 5.1claude-fable-5-1
Claude Sonnet 4.5claude-sonnet-4-5-20250929
Input (prompt) · Credits / M6≈ $0.9171.8≈ $0.275
Output (completion) · Credits / M30≈ $4.589≈ $1.38
Cache read · Credits / M0.150.18
Context window1M200K
Max output128K64K
7-day uptime——
Latest probe latency——
Measured throughput——
ProtocolsAnthropic MessagesAnthropic Messages
Sample monthly cost (10M in + 2M out)120≈ $18.3436≈ $5.50

Prices are the WandAPI default channel price in Credits (1 Credit = ¥1); green marks the better side. Uptime and latency come from WandAPI probes; a dash means the model is not probed yet.

Capabilities

CapabilityClaude Fable 5.1Claude Sonnet 4.5
Vision
Function Calling
Reasoning
Prompt Caching
Streaming
Response Schema
Web Search
Audio
Video
File Input
Realtime
Session
Media
Multipart Form
Binary Response

FAQ

Which is cheaper, Claude Fable 5.1 or Claude Sonnet 4.5?

At the WandAPI default channel price, Claude Fable 5.1 input costs 6 Credits / M and Claude Sonnet 4.5 input costs 1.8 Credits / M, so Claude Sonnet 4.5 is 70% cheaper. Output and cache prices are in the specs table above.

Which has the larger context window, Claude Fable 5.1 or Claude Sonnet 4.5?

Claude Fable 5.1 offers 1M tokens, Claude Sonnet 4.5 offers 200K tokens.

Can I switch between Claude Fable 5.1 and Claude Sonnet 4.5 at any time?

Yes. WandAPI calls every model with the same API key; switching is just changing the model field in the request, and billing is split per model in one console.

How do the capabilities of Claude Fable 5.1 and Claude Sonnet 4.5 differ?

Only Claude Fable 5.1: Response Schema, Web Search. Every other capability is either supported by both or by neither; see the capability table above.

More comparisons

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One API key for both Claude Fable 5.1 and Claude Sonnet 4.5

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