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opus 5 vs opus 5.5
Opus 5 vs Opus 5.5 measured on three tough reasoning puzzles: matching answers, 43–69% smaller bills, and roughly 11% quicker token output.
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Putting Opus 5 vs Opus 5.5 Through Real Reasoning Work
Anthropic says Opus 5.5 costs less and runs faster than Opus 5. Our runs check whether those savings and speed gains survive contact with genuine reasoning tasks.
- The Vendor's Price and Pace PromisesAnthropic advertises a bill about 40% smaller, output more than 30% quicker, and reasoning on par with Claude Fable 5.1 instead of lagging behind Opus 5.
- What the New Price Sheet SaysOpus 5.5 charges $4 per million input tokens and $20 per million output tokens, versus $5 and $25 before — that shift alone accounts for a 20% saving.
- How Each Prompt Was SentBoth models received identical prompts through the Anthropic API, adaptive thinking at default effort, with a single run per problem per model.
How We Benchmarked Opus 5 vs Opus 5.5
Three demanding reasoning problems, one attempt per model, with token counts, elapsed time, and list-price cost recorded on every call.
Opus 5 vs Opus 5.5: The Numbers Side by Side
What the runs showed on accuracy, tokens written, writing speed, and exactly where each model stumbled.
Grid Accuracy: Dead Even
Both models filled all 28 grid cells correctly; Opus 5.5 added a caveat that it had not fully confirmed the answer was the only one.
Fewer Tokens Written
Opus 5.5 produced 62% fewer output tokens on the stone game and came in 43% cheaper on the logic grid — the saving came mostly from saying less.
Tokens Per Second
Averaged over every call, Opus 5.5 streamed 103.4 tokens per second to Opus 5's 93.1, roughly 11% quicker, with a 19% edge on its best single problem.
Dollars Per Problem
The logic grid ran $0.16 on Opus 5.5 against $0.27 on Opus 5; the stone game $0.58 against $1.88. The whole test suite landed at $10.50.
Where Both Models Broke Down
The ordering puzzle beat both: either model can spend close to 20 minutes thinking and return nothing, and Opus 5.5 ended on a refusal stop reason.
When to Hand Off to Code
If a task hinges on counting — the ordering test included — give the model a code execution tool instead of trusting it to reason its way to the number.
Opus 5 vs Opus 5.5: Questions Answered
What people ask most about Opus 5 vs Opus 5.5 — pricing, output speed, and how the reasoning results actually compared.
Does Opus 5.5 cost less than Opus 5?
It does. Our logic-grid run was 43% cheaper and the stone game 69% cheaper, almost entirely because Opus 5.5 wrote fewer output tokens.
Does Opus 5.5 write output more quickly?
Yes — about 11% quicker across the board, with a 19% best-case gap on one problem. That still trails the 30% figure Anthropic promotes.
Is Opus 5.5 smarter at hard reasoning?
Not on this evidence. Both solved the logic grid and the stone game, and both returned nothing usable on the constrained orderings puzzle.
Why did Opus 5.5 refuse a benign request?
The ordering test ended with a refusal stop reason and no text — most likely a safety filter misfiring on a harmless prompt.
Should teams running Opus 5 migrate?
If you already run Opus 5, the reasoning answers do not change while the bill and the wait both drop — set a hard output ceiling before you switch.
How can I keep spend under control on hard prompts?
Cap output hard and watch the meter: either model may think for around 20 minutes, return nothing, and still bill you for every token.
Run the Opus 5 vs Opus 5.5 Benchmark on Your Own Stack
Grab the published prompts, point both models at your own workloads, then move to Opus 5.5 with a hard output limit and keep the savings.