Opus 4.6
Version 4.6 of Anthropic's Claude Opus series, used to assist with long-form text creation. It is widely adopted by independent developers in narrative and creative writing scenarios.
Timeline (last 90 days)
On the Terminal-Bench 2.0 benchmark, the same model Opus 4.6 scores from 60.45% to 82.02% under different harnesses (a gap of about 22 percentage points).
Wan was developed mainly during the Gemini 3 Pro and Opus 4.6 era.
When Fable 5 and Opus 4.6 were released, the author felt unsure how to use them.
Opus 4.6 scored only 4/28 and Opus 4.5 scored 19/28, despite content being entirely correct throughout; the author classified these as formatting failures rather than financial capability defects.
The script called the Opus 4.6 model via the standard Messages API, because the developer had copied the configuration from another project and forgotten to change the model name.
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.
Claude Opus 5.5 represents the largest iteration since Opus went from 4.5 to 4.6.
Opus 5.5 is the first version with targeted improvements to sentence clarity and information overload, but the engineer emphasized this does not mean Opus 5.5 has comprehensively surpassed Opus 4.6.
The article notes that version names such as 'Opus 4.6,' 'GPT 6,' and 'fable 5.1' may partly be user misstatements or jokes, and are not endorsed as factual.
A veteran Reddit user stated that they have been using Claude for over two years and believe Claude peaked at version Opus 4.6, with each subsequent iteration delivering a continuously declining experience.
5 more timeline events
All Facts (8)
Opus 4.5于11月发布，4.6于2月发布，4.7也已发布
70%UnverifiedOn the Terminal-Bench 2.0 benchmark, the same model Opus 4.6 scores from 60.45% to 82.02% under different harnesses (a gap of about 22 percentage points).
50%UnverifiedWhen Fable 5 and Opus 4.6 were released, the author felt unsure how to use them.
50%UnverifiedWan was developed mainly during the Gemini 3 Pro and Opus 4.6 era.
50%UnverifiedThe script called the Opus 4.6 model via the standard Messages API, because the developer had copied the configuration from another project and forgotten to change the model name.
50%UnverifiedClaude Opus 5.5 represents the largest iteration since Opus went from 4.5 to 4.6.
50%UnverifiedOpus 5.5 is the first version with targeted improvements to sentence clarity and information overload, but the engineer emphasized this does not mean Opus 5.5 has comprehensively surpassed Opus 4.6.
50%UnverifiedThe article notes that version names such as 'Opus 4.6,' 'GPT 6,' and 'fable 5.1' may partly be user misstatements or jokes, and are not endorsed as factual.
50%