Claude Sonnet 5 brings near-Opus agentic coding performance to a cheaper tier, with introductory API pricing through August 31
Anthropic says Claude Sonnet 5 improves reasoning, tool use, coding, knowledge work, agentic search, and computer use over Sonnet 4.6, while narrowing the gap with Opus 4.8. It is available across Claude plans and in Claude Code and the Claude API.
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Anthropic says Claude Sonnet 5 improves reasoning, tool use, coding, knowledge work, agentic search, and computer use over Sonnet 4.6, while narrowing the gap with Opus 4.8. It is available across Claude plans and in Claude Code and the Claude API. Introductory API pricing is $2 per million input tokens and $10 output through August 31, 2026, then $3 input and $15 output. Anthropic reports lower undesirable-behavior rates than Sonnet 4.6 but says the model has less cyber capability than its Opus models.
Teams can move more routine long-horizon coding and tool-use work onto a lower-cost model, reserving Opus-class reasoning for tasks where the extra capability earns its price.
Vendor evaluations may not predict production success, and the August 31 price change can distort pilot economics unless teams measure successful-task cost, retries, latency, and review effort at both price points.
Independent agentic-coding and computer-use evaluations, production cost per successful task, and the post-August 31 rate-limit and pricing experience.
- Benchmark Sonnet 5 against your current coding model on representative repositories, including failure recovery and human review time
- Record model, effort level, tool calls, retries, and effective cost before deciding whether the August 31 price change alters the deployment tier