Fable 5.1 API Pricing
Fable 5.1 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens on Anthropic's API. Cached input is billed at $0.25 per 1M tokens. Prices are provider list prices in USD, refreshed as sources update; see the Fable 5.1 model profile for capability scores.
Price List
| Rate | Price (USD) | Notes |
|---|---|---|
| Input | $10.00 | per 1M tokens |
| Output | $50.00 | per 1M tokens |
| Cached input (read) | $0.25 | per 1M tokens |
| Cache write | $12.50 | per 1M tokens |
| Cache write (1-hour) | $20.00 | per 1M tokens |
| Blended input + output | $60.00 | 1M in + 1M out at list price |
| Context window | 1M tokens |
What a Workload Costs
Computed straight from the list prices above — token counts are illustrative workload sizes, not measurements of Fable 5.1.
| Workload | Cost | Tokens |
|---|---|---|
| Short chat turn | $0.035 | 1K in / 500 out |
| Summarize a long document | $1.10 | 100K in / 2K out |
| Agentic coding session | $10.00 | 500K in / 100K out |
| 1M input + 1M output tokens | $60.00 | 1M in / 1M out |
Effective Cost
In AI IQ's scoring, Fable 5.1's list price is adjusted by a token-usage multiplier of 2.395 (measured from real benchmark runs), giving an effective cost of $144 per 1M input + output tokens. That places it #117 of 117 models on the effective-cost ranking (lower is cheaper). Some models spend far more tokens than others on the same task, so effective cost compares what a unit of work really costs. Method details are on the methodology page; see all models on the cost charts and the falling cost of intelligence over time.
Cheaper Alternatives at Similar Capability
Models with a lower effective cost that score within a few IQ points of Fable 5.1 (IQ 137), or better.
| Model | Provider | IQ | Effective Cost / 1M |
|---|---|---|---|
| gpt-6-astra | OpenAI | 139 | $102 |
| fable-5 | Anthropic | 137 | $70.52 |
| gpt-5.6-sol | OpenAI | 136 | $40.81 |
| opus-5 | Anthropic | 135 | $37.56 |