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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 code generation, and finance and analysis tasks in particular. It also tends to be more concise than Fable 5 in its plans and summaries. We recommend testing it as a direct upgrade wherever you use Fable 5 today, and alongside Opus 5 on reasoning-heavy tasks.
同系列或更低输入价的公开模型。 / Same provider or cheaper catalog alternatives.
| Model | Provider | Type | Input | Output |
|---|---|---|---|---|
| claude-haiku-4-5 | Anthropic | chat | 1.00 Token / 1M tokens | 5.00 Token / 1M tokens |
| claude-haiku-4-5-20251001 | Anthropic | chat | 1.00 Token / 1M tokens | 5.00 Token / 1M tokens |
| claude-sonnet-5 | Anthropic | chat | 2.00 Token / 1M tokens | 10.00 Token / 1M tokens |
| claude-opus-4-1-20250805 | Anthropic | chat | 3.00 Token / 1M tokens | 15.00 Token / 1M tokens |
| claude-sonnet-4 | Anthropic | chat | 3.00 Token / 1M tokens |
A quick read of the model identity, commercial setup, and access footprint.
Published rates, tier transitions, and modality-specific surcharges in the current catalog entry.
| Pricing | Billing mode |
|---|---|
| Prompt | $2.5714/1M tokens |
| Output | $12.8571/1M tokens |
| 5m cache write | $3.2143/1M tokens |
| 1h cache write | $5.1429/1M tokens |
| Cache hit | $0.0643/1M tokens |
Hourly usage, latency, reliability, and throughput for this model.
Top 10 AI coding agents using this model during the last 15 days.
Top 10 official SDKs and language HTTP clients using this model during the last 15 days.
| 15.00 Token / 1M tokens |
| claude-sonnet-4-20250514 | Anthropic | chat | 3.00 Token / 1M tokens | 15.00 Token / 1M tokens |
| # | AI Coding Agents Usage | Total Tokens | Requests | Success rate | Last active |
|---|---|---|---|---|---|
| #1 |  Claude Code Anthropic's official agentic coding CLI tool | 1.0B | 6.8K | 97.0% | 2026-09-08 |
| #2 | OpenCoWork Open-source collaborative AI agent workspace | 12.2M | 141 | 83.0% | 2026-09-07 |
| # | SDK / Language | Total Tokens | Requests | Success rate | Last active |
|---|---|---|---|---|---|
| #1 |  Go Language SDK / HTTP client | 842.3M | 3.9K | 96.0% | 2026-09-08 |
| #2 |  OpenAI SDK Official OpenAI client libraries | 4.8M | 19 | 68.4% | 2026-09-08 |
| #3 |  Node.js Language SDK / HTTP client |
| 0 |
| 7 |
| 0.0% |
| 2026-09-08 |
| #4 |  JavaScript Language SDK / HTTP client | 0 | 1 | 0.0% | 2026-09-07 |
| #5 |  Python Language SDK / HTTP client | 0 | 77 | 0.0% | 2026-09-08 |