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opus 5 vs opus 5.5
Opus 5 vs Opus 5.5 benchmarked on three tough reasoning puzzles: matching accuracy, up to 69% lower spend, and 11% quicker streaming.
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Opus 5 vs Opus 5.5: Where the Upgrade Pays Off
Anthropic says its newer model trims both the bill and the wait. We put that claim under a stopwatch on genuine reasoning workloads to see whether it survives real prompts.
- What Anthropic Promises on Price and LatencyThe official pitch: a bill cut by two-fifths, output more than 30% quicker, and reasoning that keeps pace with Claude Fable 5.1 instead of falling behind.
- New Per-Token RatesInput tokens now cost $4 per million and generated tokens $20 per million, replacing the older $5 and $25 tiers — a straight 20% reduction before any efficiency gains.
- How We Set Up the Reasoning TrialsBoth models received identical prompts through the Anthropic API, adaptive thinking left at default effort, with a single run per problem per model.
Running the Opus 5 vs Opus 5.5 Trials Step by Step
Three demanding reasoning puzzles, a single run per model, and every call logged for tokens, elapsed time, and list-price spend.
Opus 5 vs Opus 5.5: The Measured Numbers
Spend, token counts, streaming rate, and breakdown points recorded across every Opus 5 vs Opus 5.5 reasoning run.
Logic Grid Precision
All 28 cells landed correctly on both sides; the newer model appended a caveat admitting it had not proven the solution unique.
Output Token Economy
The stone game saw 62% fewer generated tokens, and the logic grid bill fell 43% — savings that came mostly from writing less.
Streaming Throughput
Averaged over every call, the newer model streamed 103.4 tokens per second versus 93.1, roughly 11% ahead, peaking at a 19% edge on one problem.
Spend by Problem
The logic grid ran $0.16 against $0.27, the stone game $0.58 against $1.88, and the full test series totaled $10.50.
Where Both Models Break
Neither model solved the ordering puzzle; each could spend about 20 minutes reasoning and return no text at all, with the newer one ending on a refusal signal.
When to Hand Off to Code
If the job is fundamentally counting — as the ordering round was — give the model a code execution tool instead of expecting it to reason its way to a figure.
Opus 5 vs Opus 5.5: Common Questions
Answers on pricing, streaming speed, and reasoning parity for anyone choosing between Opus 5 vs Opus 5.5.
Does Opus 5.5 cost less than Opus 5?
It does. The logic grid ran 43% cheaper and the stone game 69% cheaper, driven mainly by a smaller volume of generated tokens.
Does Opus 5.5 stream faster?
It does, about 11% quicker on average and up to 19% on the best single problem, though that still trails the 30% figure in Anthropic's marketing.
Is Opus 5.5 smarter on hard reasoning?
Not on this evidence. Both cleared the logic grid and the stone game, and both failed the constrained ordering puzzle, so the two were effectively tied.
Why did Opus 5.5 decline a harmless request?
It ended the ordering run with a refusal stop reason and empty output — most plausibly a safety filter misfiring on an innocent prompt.
Should you migrate to Opus 5.5?
If Opus 5 is already in your stack, the upgrade keeps reasoning quality level while trimming spend and latency — set a firm output cap before you switch.
How can I keep costs down on tough problems?
Cap output length and monitor usage closely: either model can think for roughly 20 minutes and return nothing at all while still charging for tokens.
Run the Opus 5 vs Opus 5.5 Trials on Your Own Stack
Grab the prompts, replay both models in your own environment, and shift to Opus 5.5 with a firm output cap to lock in the savings and the faster streaming.