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opus 5 vs opus 5.5
Opus 5 vs Opus 5.5 tested on the same API prompts: matching accuracy, bills trimmed by as much as 69%, and quicker token streaming.
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What Sets Opus 5 vs Opus 5.5 Apart
Anthropic says Opus 5.5 undercuts Opus 5 on both price and latency. Our hands-on runs check whether those promised savings survive contact with genuine reasoning work.
- The Vendor's Price and Latency PromisesMarketing points to a bill cut of 40%, output more than 30% quicker, and reasoning on par with Claude Fable 5.1 instead of lagging behind Opus 5.
- Token Rates on the APIThe newer model charges $4 per million tokens read and $20 per million written, versus $5 and $25 before — a discount that alone delivers roughly a fifth off.
- How We Tested the Reasoning TasksWe sent matching prompts to each model via the Anthropic API, adaptive thinking at default effort, with a single run per puzzle per model.
Inside Our Opus 5 vs Opus 5.5 Test Setup
Three demanding puzzles, a single run each, and every call logged for token counts, elapsed time, and list-price spend.
Opus 5 vs Opus 5.5: Scorecard Summary
Spend, token counts, streaming speed and breakdowns captured across every Opus 5 vs Opus 5.5 reasoning run.
Grid Puzzle Accuracy
Both filled all 28 cells correctly; the newer release merely flagged that it had not formally shown its solution to be the only one.
Tokens Written
On the stone game the update emitted 62% fewer completion tokens, and it undercut its predecessor by 43% on the grid — mostly by saying less.
Streaming Speed
Averaged over every call the newer model streamed 103.4 tokens per second versus 93.1, near 11% quicker, peaking at a 19% edge on one puzzle.
Spend by Problem
The grid round cost $0.16 against $0.27, and the stone game $0.58 against $1.88, bringing the whole experiment to $10.50.
Where Both Models Faltered
Neither solved the ordering task; both can spend about 20 minutes reasoning and return an empty reply, and the newer model ended on a refusal stop reason.
When to Hand Over a Code Tool
For anything that boils down to enumeration, the ordering task included, give the model a code execution tool instead of expecting it to reason its way to the figure.
Opus 5 vs Opus 5.5: Your Questions Answered
Quick answers on Opus 5 vs Opus 5.5 pricing, streaming speed, and reasoning accuracy.
Does Opus 5.5 cost less than Opus 5?
It does. We measured 43% lower spend on the grid puzzle and 69% lower on the stone game, driven mainly by fewer completion tokens.
Does Opus 5.5 stream output faster?
About 11% faster on average, topping out at 19% on one puzzle — well short of the 30% improvement Anthropic advertises.
Is Opus 5.5 smarter at reasoning?
No measurable difference. Both cleared the logic grid and the stone game, and both failed the constrained ordering puzzle.
Why did Opus 5.5 refuse a benign request?
It ended the ordering task with a refusal stop reason and empty text — most likely a safety filter misfiring on a harmless prompt.
Should I migrate to Opus 5.5?
If Opus 5 is your current model, the switch is easy to justify: reasoning quality holds while spend and latency drop. Set an output ceiling first.
How can I keep costs down on tough tasks?
Cap output tokens and monitor usage, because either model can think for roughly 20 minutes, return nothing, and still bill you for the tokens.
Run Your Own Opus 5 vs Opus 5.5 Trials
Grab the prompts above, replay them on your own stack, and adopt Opus 5.5 with an output cap to lock in the savings and the quicker streaming.