How often does Claude use tools?
We looked through 2.27M Claude responses we collected to find out.
The Opus models show a clear downward trend in tool calls from Opus 4.6 to Opus 4.8. However, Fable 5 stands out against that pattern, averaging 1.00 tool calls per response compared with 0.76 for Opus 4.8 and 0.79 for Opus 5. (1/2)🧵
Tool-call frequency directly drives AI agentAn AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.Full definition → latency and cost, and this is rare measured data on how it differs across current frontier models.
Terms in this piece · Glossary
AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
