Claude Sonnet 4.5
Anthropic · Claude 4
Balanced Claude tier for production reasoning, coding, and long-context assistant workflows.
Overview
Freshness note: Model capabilities, limits, and pricing can change quickly. This profile is a point-in-time snapshot last verified on February 15, 2026.
Claude Sonnet 4.5 is positioned as a balance point between premium-depth Claude tiers and lower-cost options. It is meant for teams that need reliable quality for coding, analysis, and writing without always using top-tier inference.
Capabilities
The model is effective in structured reasoning, technical writing, and implementation planning. It can support mixed enterprise workflows where context quality and instruction fidelity matter.
Technical Details
Sonnet-class models are typically tuned for broad production utility. This tier is useful when teams need consistent behavior across code, documentation, and decision-support tasks.
Pricing & Access
Available through Anthropic API surfaces and partner platforms that provide Claude model access. Pricing and limits can change by tier and channel, so confirm latest values in Anthropic’s official docs.
Best Use Cases
Good choice for engineering copilots, technical documentation workflows, analysis-heavy support tooling, and mid-to-high complexity product planning.
Comparisons
Compared with Claude Opus 4.6, Sonnet 4.5 is usually more cost-efficient but less powerful on hardest reasoning tasks. Compared with GPT-5, Sonnet may be preferred for Anthropic-native workflows and writing style. Compared with Gemini 2.5 Pro, selection depends on multimodal requirements and platform strategy.