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Head to head · prices checked 22 September 2026

Claude Fable 5.1 vs Claude Opus 5

Fable costs twice as much as Opus, so buyers ask what the premium buys. Both list prices from the makers’ own pages, and what three everyday jobs cost on each.

What a job costsEvery model

US dollars, standard rate, shortest context band. Price only: this page does not rank quality.

1,000 support replies
2×what Claude Fable 5.1 costs next to Claude Opus 5
Claude Fable 5.1
$50.00
Claude Opus 5
$25.00
Claude Fable 5.1, per M tokens
$10 / $50
Claude Opus 5, per M tokens
$5 / $25

3,000 tokens in and 400 out each, at list price.

Per million tokens, Claude Fable 5.1 costs $10 in and $50 out; Claude Opus 5 costs $5 in and $25 out. 1,000 support replies cost $50.00 on Claude Fable 5.1 and $25.00 on Claude Opus 5, so Claude Fable 5.1 costs twice as much. Both read up to 1M tokens at once.

Side by side

Each maker’s published rate for its standard tier. Cached input is what a repeated prompt prefix costs once the provider has stored it.

Claude Fable 5.1 and Claude Opus 5: list prices and specifications
FactClaude Fable 5.1Claude Opus 5
MakerAnthropicAnthropic
TierFlagshipsFlagships
Input, per M tokens$10.00$5.00
Output, per M tokens$50.00$25.00
Cached input$0.25$0.50
Context window1M1M
Released1 Sep 202624 Jul 2026
WeightsClosedClosed

What a job costs on each

1,000 runs of each job at the two list prices. The gap moves from job to job because the models price input, output and cached context differently.

Cost of 1,000 runs of three jobs on Claude Fable 5.1 and Claude Opus 5
JobClaude Fable 5.1Claude Opus 5Cheaper
Support reply3,000 in, 400 out.$50.00$25.00Claude Opus 5, 50% less
Document summary25,000 in, 1,000 out.$300$150Claude Opus 5, 50% less
Agent task80,000 in (70,000 cached), 3,000 out.$268$160Claude Opus 5, 40% less

The token counts are ours, chosen to look like real work; the prices are the makers’. A model with no published cache price bills the agent task’s repeated context at its full input rate.

The small print

What each base rate leaves out, from the makers’ own pages: surcharges, discounts, promotions and cache pricing.

Claude Fable 5.1
Cache read is 0.025x input on this model ($0.25). Cache write $12.50 (5 min) or $20 (1 h). Batch API 50% off. US-only inference (inference_geo) bills 1.1x. Full context window billed at standard rates. Anthropic’s pricing page
Claude Opus 5
Cache write $6.25 (5 min) or $10 (1 h). Fast mode $10 / $50. Batch API 50% off. US-only inference (inference_geo) bills 1.1x. Full context window billed at standard rates. Anthropic’s pricing page

Other comparisons

Every head to head on the list that involves Claude Fable 5.1 or Claude Opus 5.

Run both for a quarter of list price

AIGROW API credit covers Claude Fable 5.1 and Claude Opus 5 and is metered at the list prices above: $25 buys $100 of usage.

See API creditCompare every model

Prices checked 22 September 2026