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opus 5 vs opus 5.5
For anyone weighing Opus 5 vs Opus 5.5: both solved our logic and stone-game tests, while the newer model cut spend sharply and streamed tokens faster.
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Why This Opus 5 vs Opus 5.5 Comparison Matters
Anthropic advertises Opus 5.5 as the leaner, quicker successor to Opus 5. Our hands-on runs test whether those savings survive genuine multi-step reasoning work.
- The Vendor's Price and Pace PromisesThe pitch is a bill trimmed by 40%, output running more than 30% quicker, and reasoning on par with Claude Fable 5.1 rather than lagging behind Opus 5.
- New Per-Token RatesEach million input tokens now costs $4 and each million generated tokens $20, against $5 and $25 before — a cut that on its own trims roughly a fifth off the bill.
- How the Reasoning Tests WorkedThe same prompts went to each model through the Anthropic API with adaptive thinking left at default effort, running once per problem per model.
Inside the Opus 5 vs Opus 5.5 Test Runs
Three demanding reasoning puzzles, a single run per model, and full logging of tokens, elapsed time, and list-price cost on every call.
Opus 5 vs Opus 5.5: Scorecard Summary
What our runs revealed about spend, token output, streaming speed, and where each model stumbled during the Opus 5 vs Opus 5.5 tests.
Accuracy on the Logic Grid
Both models filled all 28 grid cells correctly, though Opus 5.5 flagged that it had not fully proved the solution was unique.
Fewer Output Tokens
On the stone game the newer model emitted 62% fewer output tokens, and on the logic grid it spent 43% less — savings driven mostly by writing less.
Tokens Per Second
Averaged over every call, Opus 5.5 streamed 103.4 tokens per second versus 93.1 — a gain near 11%, peaking at 19% on its best problem.
Spend on Each Problem
The logic grid ran $0.16 against $0.27, the stone game $0.58 against $1.88, and the whole experiment came to $10.50.
Where Both Models Failed
Neither model cracked the ordering puzzle; each could think for about 20 minutes and return no answer, and Opus 5.5 ended on a refusal stop reason.
Use a Code Tool for Counting
If the real work is enumeration — as in the ordering puzzle — give the model a code execution tool instead of expecting it to reason its way to the figure.
Opus 5 vs Opus 5.5: Questions Answered
Quick answers on Opus 5 vs Opus 5.5 pricing, throughput, and how each model performed on hard reasoning.
Does Opus 5.5 cost less than Opus 5?
It does — 43% less on the logic grid and 69% less on the stone game, chiefly because it produced fewer output tokens.
Does Opus 5.5 run faster than Opus 5?
Overall it streamed about 11% faster and led by 19% on its best problem, though that still falls short of the 30% figure Anthropic promotes.
Is Opus 5.5 smarter at reasoning?
Not on these tests. The pair were inseparable — both solved the logic grid and the stone game, and both produced nothing on the constrained orderings puzzle.
Why did Opus 5.5 refuse a harmless request?
During the ordering test it stopped with a refusal reason and returned no text at all — almost certainly a safety filter misfiring on an innocent prompt.
Is it worth switching to Opus 5.5?
If Opus 5 is your current model, yes — reasoning quality holds while cost and latency drop. Just cap the output length before you start.
How can I keep costs down on tough problems?
Cap output tokens and monitor spend closely: either model can think for roughly 20 minutes, return nothing, and still charge you for the tokens.
Run Your Own Opus 5 vs Opus 5.5 Test
Grab the published prompts, test both models on your own stack, and switch to Opus 5.5 with an output cap in place to lock in the savings and speed.