Sonnet 4.6
A preceding model in Anthropic's Claude Sonnet series, used as a comparative baseline for evaluating the capabilities of Claude Sonnet 5.
Timeline (last 90 days)
Among Claude model options, Opus 4.6 is suited for heavy tasks but is unavailable in the free tier, Sonnet 4.6 is the default model for the free tier, and Haiku is faster and consumes fewer tokens.
Sonnet 4.6 was released in February 2026 and has a context window of approximately one million tokens.
In scenarios such as mathematical derivation that require strict rule-following, the less capable Sonnet 4.6 with temperature=0 is more willing to follow instructions than the more capable Opus, and often achieves a higher success rate.
All Facts (3)
Among Claude model options, Opus 4.6 is suited for heavy tasks but is unavailable in the free tier, Sonnet 4.6 is the default model for the free tier, and Haiku is faster and consumes fewer tokens.
50%UnverifiedIn scenarios such as mathematical derivation that require strict rule-following, the less capable Sonnet 4.6 with temperature=0 is more willing to follow instructions than the more capable Opus, and often achieves a higher success rate.
50%UnverifiedSonnet 4.6 was released in February 2026 and has a context window of approximately one million tokens.
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