Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
AI model by Anthropic. Real-time pricing and benchmark data.
Benchmarks
Editorial Analysis
Profile. Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) is a premium-tier model from Anthropic at $50.00/M output tokens. Benchmark scores (e.g. GPQA Diamond 92.6%) suggest it targets workloads where correctness matters more than cost — long-running agents, code generation at scale, and complex multi-step reasoning.
Latency. On latency, Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) reports 59 tok/s output speed and 65797ms time-to-first-token. Output speed is on the slower end; for real-time chat consider pairing with a streaming front-end or routing latency-sensitive requests to a faster model.
Cost model. For a workload of 1M input tokens + 100K output tokens, Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) costs $15.00 per million input-equivalent requests. Multiply by your monthly request volume to project the bill, and compare against the speed/correctness profile above to decide if the trade-off is worth it for your workload.
Editorial summary generated from public pricing and benchmark data (Artificial Analysis API). All numbers are sourced — see the Artificial Analysis methodology for benchmark definitions. Last refreshed 2026-07-24.
Compare with similar models
| Model | Input | Output | Speed |
|---|---|---|---|
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)Current | $10.00 | $50.00 | 59 tok/s |
| o1 | $15.00 | $60.00 | 0 tok/s |
| GPT-4 | $30.00 | $60.00 | 0 tok/s |
| o1-preview | $16.50 | $66.00 | 0 tok/s |
| GPT-5.6 Sol (high) | $5.00 | $30.00 | 60 tok/s |
| GPT-5.6 Sol (max) | $5.00 | $30.00 | 62 tok/s |