Claude
Anthropic
An assistant used widely for research and work, on the web and in its apps.
Overview
An assistant used widely for research and work, on the web and in its apps.
Versions
Claude Opus 5.5
Released
Documented for long-running agentic coding and knowledge work. Anthropic describes a moderate-latency model with adaptive thinking; product and platform access vary.
Claude Sonnet 5.5
Released
A documented balance of speed and intelligence for general work, with adaptive thinking.
Claude Haiku 5.5
Released
The faster model line for high-volume, latency-sensitive tasks such as classification, extraction, and routing.
Claude Fable 5.1
A documented option for demanding reasoning and long-horizon agentic tasks. These provider model families do not establish the exact version used for a GeckoCheck result.
Capabilities
Text and image understanding
Current documented models accept text and images and produce text. Vision support is input understanding, not a claim that the base model generates images.
Reasoning and coding
Supports complex reasoning, software tasks, and professional knowledge work, with model-dependent thinking and effort controls.
Long-context analysis
Current model documentation lists a one-million-token context window, allowing large inputs where the platform and request settings support them.
Multilingual work and tools
Supports multilingual tasks and tool use. Web search and code execution depend on the supported tool version and organization settings; they are not automatically enabled for every response.
Claude in GeckoCheck
GeckoCheck reads how Claude answers the queries a brand cares about: whether it names the brand, how it describes it, who it names instead, and which pages it cites.
Each model is read and graded on its own, because each answers differently. A brand's plan sets which models it tracks.
Sources
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