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Solve a difficult reasoning problem

What decision or puzzle needs sustained reasoning?

PrivacyNon-sensitive inputsDeploymentHosted service allowedScaleOccasional to moderate volumeLatencyInteractive, not real-timeBudgetBalanced quality and costReliabilityHuman review for consequential output
Refine these assumptions in the Calibration Room

2 candidates. No automatic winner.

These are dated starting points under the disclosed defaults. Evaluate these approaches against your workload.

Quality & reliability

Claude Opus 5

Inside: direct model call

LifecyclecurrentVerified2026-08-27Evidence1 provider source + RS interpretationStatuscurrent

A quality-first candidate for sustained reasoning and alternative analysis.

TradeoffHigher cost and latency require a task-specific gain to justify them.

Why?
  • supports reason
  • accepts text
  • fits quality-reliability
Go deeper

This approach joins the release claude-opus-5 to the deployment offer anthropic-claude-opus-5-api. The recommendation is dated RS interpretation, not a provider ranking.

Technical details

Modalities: text, image. Access: proprietary. Evidence class: rs-interpretation.

Evaluation plan

  1. Create twenty difficult cases with known rubrics.
  2. Blind-score conclusions and reasoning errors.
  3. Track latency variance and cost.
Inspect the model recordProvider source

Speed & cost

Gemini 3.1 Pro Preview

Inside: direct model call

LifecyclepreviewVerified2026-08-27Evidence1 provider source + RS interpretationStatuscurrent

A preview alternative worth measuring on complex multimodal reasoning.

TradeoffPreview lifecycle risk makes it unsuitable as the only production choice.

Why?
  • supports reason
  • accepts text
  • fits speed-cost
Go deeper

This approach joins the release gemini-3.1-pro-preview to the deployment offer google-gemini-3-1-pro-api. The recommendation is dated RS interpretation, not a provider ranking.

Technical details

Modalities: text, image, audio, video. Access: proprietary. Evidence class: rs-interpretation.

Evaluation plan

  1. Use the same twenty cases.
  2. Track regressions across the preview identifier.
  3. Compare review effort and latency.
Inspect the model recordProvider source
See what did not enter this shortlist
  • deepseek-v4-flash: offer does not support interactive latency