API price comparison · Updated
Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Claude Opus 5.5 costs $4.00 and $20.00. For an agent task (80,000 input tokens, 60,000 of them cached, and 6,000 output), Claude Fable 5.1 costs $0.515 and Claude Opus 5.5 $0.212: Claude Fable 5.1 costs 2.4× as much.
Claude Opus 5.5 costs 60% less for this workload. Excludes cache writes, tools and taxes.
| Price | Claude Fable 5.1 | Claude Opus 5.5 |
|---|---|---|
| Model ID | claude-fable-5-1 | claude-opus-5-5 |
| Input | $10.00 | $4.00 |
| Cache read | $0.25 | $0.20 |
| Cache write | $12.50 | $5.00 |
| Output | $50.00 | $20.00 |
| Batch in / out | $5.00 / $25.00 | $2.00 / $10.00 |
| Long prompts | Same rate | Same rate |
| Scheduled change | None announced | None announced |
| Status | Available | Available |
Prices for each provider’s own API, from Anthropic’s pricing page. The lower price in each row is highlighted. Ganivra uses these same rates to price Claude Fable 5.1 and Claude Opus 5.5 calls.
Worked out from the prices above at standard rates, with no Batch discount. Long-prompt rates apply where a model has them.
| Request | Claude Fable 5.1 | Claude Opus 5.5 | Per 1,000 requests | Difference |
|---|---|---|---|---|
| Chat reply3,000 input tokens, 500 output | $0.055 | $0.022 | $55.00 / $22.00 | Claude Fable 5.1 costs 2.5× as much |
| Document summary30,000 input tokens, 1,500 output | $0.375 | $0.150 | $375 / $150 | Claude Fable 5.1 costs 2.5× as much |
| Agent task80,000 input tokens (60,000 cached), 6,000 output | $0.515 | $0.212 | $515 / $212 | Claude Fable 5.1 costs 2.4× as much |
| Long document300,000 input tokens, 2,000 output | $3.10 | $1.24 | $3,100 / $1,240 | Claude Fable 5.1 costs 2.5× as much |
Ganivra prices every Claude Fable 5.1 and Claude Opus 5.5 call you make and adds it up by customer, feature and workflow, next to what each customer pays. Switch a workflow and see what it did to each customer’s margin.
Per million tokens, Claude Fable 5.1 costs $10.00 input and $50.00 output, and Claude Opus 5.5 $4.00 input and $20.00 output. For an agent task (80,000 input tokens, 60,000 of them cached, and 6,000 output), Claude Fable 5.1 costs 2.4× as much: $515 against $212 per 1,000 tasks.
$10.00 input and $50.00 output per million tokens on Anthropic's API, with cached input at $0.25 and Batch at $5.00 input and $25.00 output. The rate is the same at any prompt length.
$4.00 input and $20.00 output per million tokens on Anthropic's API, with cached input at $0.20 and Batch at $2.00 input and $10.00 output. The rate is the same at any prompt length.
For a 300,000 input tokens, 2,000 output request, Claude Fable 5.1 costs $3.10 and Claude Opus 5.5 $1.24: Claude Fable 5.1 costs 2.5× as much. On Claude Fable 5.1, one rate at any prompt length; on Claude Opus 5.5, one rate at any prompt length.
Record what each call actually used, then price the same usage on both models. Ganivra does this from your recorded calls: it shows what each customer, feature and workflow would cost on Claude Fable 5.1 and on Claude Opus 5.5, next to what each customer pays you.
Every model on one page: Claude Fable 5.1 pricing · Claude Opus 5.5 pricing · all model price comparisons · all supported models.