Grok 4.5 and Claude Opus 4.8 compared on the two benchmarks that split them: SWE-Bench Pro repository fixes and Terminal-Bench agentic tasks, plus the token efficiency gap that decides cost per completed issue.
Claude Haiku 4.5, Fable 5 Mini, and Gemini 3.1 Flash on Terminal-Bench 2 agentic coding. Task completion rate, cost per resolved task, tool call accuracy, and the cheap tier routing decision for production agent fleets in 2026.
Gemini 3.5 Pro vs Claude Opus 4.8 on Terminal-Bench 2. Resolve rate, step budget, latency, and cost per resolved task that decide which frontier model wins for a terminal native coding agent in 2026.
Claude Opus 4.8 vs Claude Fable 5 on Terminal-Bench 2.0, cost per task, tool use reliability, and where each Anthropic model wins for production agent workloads.