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 SoleAPI default channel price. Input costs 13 Credits / M for Claude Fable 5.1 and 1.5 Credits / M for Claude Sonnet 4.5, so Claude Sonnet 4.5 is 88% cheaper. Context windows are 1M and 200K.
Specs side by side
| Item | Claude Fable 5.1claude-fable-5-1 | Claude Sonnet 4.5claude-sonnet-4-5-20250929 |
|---|---|---|
| Input (prompt) · Credits / M | 13≈ $1.96 | 1.5≈ $0.226 |
| Output (completion) · Credits / M | 65≈ $9.79 | 7.5≈ $1.13 |
| Cache read · Credits / M | 0.325 | 0.15 |
| Context window | 1M | 200K |
| Max output | 128K | 64K |
| 7-day uptime | — | — |
| Latest probe latency | — | — |
| Measured throughput | 12.5 t/s | 2.4 t/s |
| Protocols | Anthropic Messages / OpenAI Responses | Anthropic Messages / OpenAI Responses |
| Sample monthly cost (10M in + 2M out) | 260≈ $39.15 | 30≈ $4.52 |
Prices are the SoleAPI default channel price in Credits (1 Credit = ¥1); green marks the better side. Uptime and latency come from SoleAPI probes; a dash means the model is not probed yet.
Capabilities
FAQ
Which is cheaper, Claude Fable 5.1 or Claude Sonnet 4.5?
At the SoleAPI default channel price, Claude Fable 5.1 input costs 13 Credits / M and Claude Sonnet 4.5 input costs 1.5 Credits / M, so Claude Sonnet 4.5 is 88% 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. SoleAPI 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?
Their capability flags are identical. Every other capability is either supported by both or by neither; see the capability table above.
More comparisons
One API key for both Claude Fable 5.1 and Claude Sonnet 4.5
Free credits on sign-up, pay as you go, no monthly fee.