# Claude Sonnet 5.5 rivals Opus with 'thinking budget' settings

Digest AI · Marketing & Small Business · published 2026-09-29T04:03:00Z

Canonical: https://digestai.news/story/claude-sonnet-5-5-rivals-opus-with-thinking-budget-settings

## Summary

Claude Sonnet 5.5, released in July, now matches Opus 5.5 in performance on many tasks while costing about half as much. The model’s new 'effort' or 'thinking budget' settings—ranging from *low* to *max*—let users adjust output quality and cost dynamically, with *high* settings sometimes outperforming Opus at *medium* effort. The author, who previously assigned cheaper tasks to Sonnet and complex work to Opus, now suggests using Sonnet with higher thinking budgets first before escalating to Opus or the pricier Fable model, reducing reliance on expensive tiers.

The author notes that Sonnet 5.5’s ability to handle tasks like playing *Pokémon Red* via screenshots—something previous Sonnet versions struggled with—demonstrates a leap in capability. The 'thinking budget' setting can drastically alter costs: *max* effort may quadruple token usage compared to *medium*, impacting billing. The author’s workflow now prioritizes Sonnet with elevated effort settings to stretch usage limits, especially on the $20/month plan, challenging the notion that serious Claude use requires the $200/month top-tier plan.

## Key points

- Claude Sonnet 5.5 matches Opus 5.5 performance in tests while costing ~half as much per million tokens
- 'Thinking budget' settings (low to max) let users trade cost and quality, with *high* often outperforming Opus at *medium*
- Author shifts workflow to use Sonnet with elevated effort first, reducing reliance on pricier Opus or Fable tiers

## Why it matters

Sonnet 5.5’s parity with Opus at lower cost could shift how users allocate tasks, reducing reliance on expensive models and expanding options for budget-conscious workflows.

## Sources

1. [How to use Claude Sonnet 5.5 alongside Opus: Adjusting costs and results with 'thinking budget' settings](https://note.com/sasuu/n/ncd11d5c415cb?hl=en) (note.com, 2026-09-29)

## Cite

Digest AI, "Claude Sonnet 5.5 rivals Opus with 'thinking budget' settings", 29 September 2026, https://digestai.news/story/claude-sonnet-5-5-rivals-opus-with-thinking-budget-settings

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