Claude Opus 5.5 – research, charts and update plan
Project presenting research, visualizations and the update roadmap for Claude Opus version 5.5.
Claude Opus 5.5 is an artificial intelligence model from Anthropic, released on September 22, 2026. The research brings together information about pricing, test results, API changes—the interface programs use to access the model—and a plan to update INEMA systems.
For people using the model, the source notes that it costs less than Opus 5 and outperforms it in nearly all the tests cited, though it scores lower in some. The update also requires care: four changes can interrupt older code, including the removal of the option to turn off reasoning and changes to how tools are used.
To get started, the research recommends setting the effort level explicitly and evaluating low and medium before increasing it. Anyone maintaining an integration should check the migration items, such as the model identifier, response format, and conversation history. The plan is documented, but the source says no changes have yet been made to production systems.
The link opens the original content; some require a subscription.
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