Claude 4.5 (Opus / Sonnet / Haiku)
AI Model
Coding
Prior generation
Anthropic's late-2025 frontier line — leading real-world coding benchmarks.
You're looking at an AI model record: who built it, what it can do, and the hardware and data behind it.
The 4.5 generation arrived tier by tier through late 2025 — Sonnet 4.5 (September), Haiku 4.5 (October), Opus 4.5 (November) — with Anthropic positioning Sonnet 4.5 and then Opus 4.5 as the strongest models available for coding, agents and computer use, at sharply reduced prices. They power Claude Code and most serious agentic-coding stacks. Parameters undisclosed.
How this connects to the rest of the stack
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Developed by
Trained on
Runs inference on
Benchmarked on
Succeeded by
Successor to
Competes with
Sources
Record reviewed as of 2026-08-31 — see Methodology.