Claude Opus 5.5 for long tasks: split the work into checked stages
Use explicit deliverables, checkpoints and limits. Treat the provider’s lower-cost claim as a workload-dependent comparison, not a guaranteed saving.
In brief
Anthropic describes Opus 5.5 as suitable for long, complex tasks. A useful evaluation asks whether it can maintain requirements and deliver checked intermediate results, rather than simply produce a long answer.
Checkpoints reveal a wrong assumption early and make a long task recoverable without restarting everything.
Keep requirements inspectable
For a large document, provide a required outline and source register. For code, give scope, protected behaviour and validation commands. Ask the task to retain unresolved questions rather than quietly filling them with plausible facts.
Use checkpoints with evidence
Review a draft section or a bounded code diff before the whole deliverable grows around a mistake. Distinguish an artifact created from one tested. Preserve useful completed work when revising scope instead of treating every follow-up as a new project.
Compare actual completion
Check all required outputs, dates, citations and commands against evidence. Include any failed attempts in the total usage. A lower token rate can help, but only the cost of a correct completed job answers your purchase or migration question.
Before you act
The provider’s cost-reduction figures come from its settings and workloads. Actual usage, tools and retries vary; this page does not claim our own benchmark or guarantee a percentage saving.
What to do next
- Define the deliverable and constraints before starting.
- Ask for intermediate artifacts and meaningful checks.
- Review deviations, total usage and completion evidence before expanding the task.
