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opus 5.5 vs fable
Claude Opus 5.5 vs Fable 5.1: see how the two models stack up after 15 timed coding trials on accuracy, token spend, pricing, and runtime.
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Why Opus 5.5 Undercuts Fable 5.1 on Token Price
Launched September 22, Claude Opus 5.5 bills $4 per million input and $20 per million output tokens — less than half of Fable 5.1's $10 and $50 — yet the two clear the same coding suites.
- Matching Scores on Coding TasksAcross five attempts apiece, each model passed the hidden agentic and resolver suites; Fable 5.1 notched 15 flawless runs while Opus 5.5 managed 13.
- Token Price DifferenceList pricing puts Opus 5.5 at $4/$20 per million input and output tokens against Fable 5.1's $10/$50 — less than half the rate per token.
- Leaderboard Wins vs. Everyday BehaviorOpus 5.5 leads Terminal-Bench 4.0, FrontierCode, and CursorBench, but those scores overlook Fable 5.1's faster replies and Opus 5.5's tendency to overthink.
How We Scored Opus 5.5 vs Fable 5.1
Every task ran five times and was graded by hidden suites, with token counts, list-price spend, and wall-clock time logged for each attempt.
Key Findings: Opus 5.5 vs Fable 5.1 Trials
Six takeaways from 15 timed trials spanning bug fixing, spec writing, concurrency debugging, token burn, response speed, and premium pricing.
Bug-Fixing Agents
Each model repaired all four defects and passed the 12 hidden checks, yet Opus 5.5 left the flaky test alone while Fable 5.1 deleted a simulated carrier delay to force a green run.
Writing the Resolver Spec
Both models cleared all 120 hidden checks; Opus 5.5 consumed 83% more tokens but cost 28% less per run, while Fable 5.1 replied sooner.
Debugging Race Conditions
Fable 5.1 eliminated all three race conditions in every run; Opus 5.5 matched that three times but exhausted the 128,000-token ceiling and returned no answer twice.
Per-Token Cost Efficiency
Opus 5.5's $4/$20 rate is less than half of Fable 5.1's $10/$50, yet the total test bill fell only 22% because Opus produced 2.2 times the output tokens.
Pace and Token Discipline
Fable 5.1 finished first on every task and never exceeded 55,000 tokens; across 15 trials Opus 5.5 took 67% longer and reached the token cap twice.
Is Either Worth a Premium?
Our take: neither earns a premium badge — Opus 5.5 overthinks, Fable 5.1 cuts corners, and paying more buys speed and fewer dead ends, not sounder judgment.
Opus 5.5 vs Fable 5.1 — Common Questions
Answers on accuracy, pricing, timeouts, and how to choose between these two Claude models.
Does Opus 5.5 match Fable 5.1 on accuracy?
When it completed a run, Opus 5.5 scored level with its rival on both the agentic and resolver tasks; the flawless-run count still favored Fable 5.1, 15 to 13.
Does Fable 5.1 still deserve its premium label?
Our trials say no — a premium tag suits neither model, since one overthinks the job while the other trims code just to keep a suite green.
Which one charges less per token?
Opus 5.5 lists at $4/$20 per million input and output tokens versus Fable 5.1's $10/$50, and our full test bill landed 22% lower.
What caused Opus 5.5 to time out on concurrency work?
On two of five concurrency attempts, Opus 5.5 spent the entire 128,000-token output budget and returned nothing, with each run taking about 19 minutes and costing $2.57.
When is Opus 5.5 the better pick for agent workflows?
Choose Opus 5.5 when your agent can run tests and self-verify, since it checks its own edits rather than deleting code to force a pass.
When does Fable 5.1 win on one-shot problems?
Reach for Fable 5.1 when a hard problem must be solved in a single pass or turnaround time matters most — then review its edits afterward.
Pick Your Claude Model: Opus 5.5 vs Fable 5.1
Inspect the edits each model made to pass, then go with Opus 5.5 for test-driven agent work or Fable 5.1 when one-shot answers and speed matter more.