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Opus vs Sonnet vs Haiku: A Cost-vs-Capability Routing Guide

von Ashish Dubey

Published: October 19, 2026

Opus vs Sonnet vs Haiku: Cost-vs-Capability Routing — TrueFoundry

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Häufig gestellte Fragen

What’s the difference between Opus, Sonnet, and Haiku?

They are Claude tiers trading capability for price. Haiku 5.5 is the fastest and cheapest for high-volume tasks; Sonnet 5.5 balances speed and intelligence; Opus 5.5 is the recommended default for most workloads. Fable 5.1 sits above them for the most demanding reasoning. All share a 1M-token context window.

Which Claude model is cheapest?

Haiku 5.5, starting around $0.10 input / $0.50 output per million tokens as of October 2026. Fable 5.1 is the most expensive at $10 / $50. Confirm current rates on Anthropic’s pricing page.

Should I just use the most capable model everywhere?

Usually not — most requests don’t need it, and the price spread from Haiku to Fable is roughly 100x. Route easy, high-volume work to cheaper tiers and reserve the top tiers for hard tasks.

How do I route by task without rewriting my app?

Point the app at a logical model name backed by a tier, or use a gateway’s automatic routing to score each request and pick a tier. The application calls one endpoint; the routing lives in configuration.

Does a bigger context window mean a better model?

Not here — all four tiers share the same 1M-token window. Choose on reasoning depth and latency, not context size.

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