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opus 5 vs opus 5.5
See how Opus 5 vs Opus 5.5 performs on tough reasoning tasks, with side-by-side cost, speed, and accuracy insights from real API runs.
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What the Opus 5 vs Opus 5.5 Upgrade Really Changes
Anthropic says the newer model is cheaper and quicker. We put Opus 5 vs Opus 5.5 through practical reasoning work to see if those promised gains actually appear.
- What Anthropic Promises on Price and PaceThe company claims a 40% lower bill, over 30% faster output, and reasoning on par with Claude Fable 5.1 rather than behind Opus 5.
- New API Rate CardOpus 5.5 charges $4 per million input tokens and $20 per million output tokens, down from $5 and $25 — a 20% reduction before any token savings.
- How We Tested ReasoningBoth models received the same prompts through the Anthropic API with adaptive thinking at default effort, one run per problem per model.
Our Opus 5 vs Opus 5.5 Test Procedure
Three difficult reasoning problems, one run per model, with tokens, elapsed time, and list-price cost recorded on every API call.
Opus 5 vs Opus 5.5: Key Findings
We measured cost, token use, writing speed, and failure patterns across the Opus 5 vs Opus 5.5 reasoning runs.
Logic Grid Precision
Both models filled all 28 grid cells correctly; Opus 5.5 added a caveat that it had not fully proven the answer was unique.
Output Token Savings
Opus 5.5 produced 62% fewer output tokens on the stone game and cost 43% less on the logic grid, mainly by writing less.
Streaming Throughput
Across every call, Opus 5.5 reached 103.4 tokens per second versus 93.1 for Opus 5 — about 11% faster, with a 19% best-case lead on one problem.
Per-Problem Spend
Opus 5.5 cost $0.16 versus $0.27 on the logic grid and $0.58 versus $1.88 on the stone game; total test spend was $10.50.
Where Both Models Stalled
The ordering puzzle beat both models: each can spend roughly 20 minutes thinking and return nothing, and Opus 5.5 ended with a refusal stop reason.
When to Use a Code Tool
If a task really requires counting — including the ordering test — give the model a code execution tool instead of trusting it to reason to the number.
Opus 5 vs Opus 5.5 Questions Answered
Answers to common questions about Opus 5 vs Opus 5.5 pricing, response speed, reasoning quality, and safe cost controls.
Does Opus 5.5 Cost Less Than Opus 5?
Yes. It was 43% cheaper on the logic grid and 69% cheaper on the stone game, largely because it generated fewer output tokens.
Is Opus 5.5 Faster in Practice?
Yes, about 11% faster overall, with its largest single-problem advantage at 19% — still below the 30% improvement Anthropic advertises.
Does Opus 5.5 Reason More Accurately?
No. On these three problems the models were indistinguishable: both solved the logic grid and stone game, and both failed the constrained ordering puzzle.
Why Did Opus 5.5 Reject a Harmless Prompt?
On the ordering test it ended with a refusal stop reason and no text, most likely a safety filter mistakenly flagging a harmless request.
Should You Upgrade to Opus 5.5?
If you already use Opus 5, yes: hard-reasoning answers stay the same while cost and wait time shrink — but set a hard output limit first.
How Can You Keep Hard-Problem Costs Under Control?
Set a hard ceiling on output and monitor spend, since either model may think for around 20 minutes, return nothing, and still bill tokens.
Run Your Own Opus 5 vs Opus 5.5 Comparison
Copy the published prompts, test both models on your own setup, and move to Opus 5.5 with a hard output cap to capture the cost and speed gains.