What Claude Sonnet 4.6 Is
Claude Sonnet 4.6 is Anthropic's high-value mid-tier model — approaching Opus-level performance on coding, computer use, and agent orchestration, with a 1M-token context window and adaptive thinking, at a fraction of Opus's price. For most production work that doesn't need the absolute frontier, Sonnet is the model you actually reach for.
Pricing
Per 1M tokens: $3.00 input / $15.00 output — versus Opus 4.8 at $5/$25. Batch API halves it (50% off), and prompt caching cuts cached input ~90%. On LinkModel it runs behind one key alongside GPT, Gemini, and DeepSeek, up to 30% below official.
| Sonnet 4.6 | Opus 4.8 | |
|---|---|---|
| Input / Output | $3 / $15 | $5 / $25 |
| Tier | High-value mid | Flagship |
| Context | 1M | 1M |
| Best for | Scaled production | Hardest tasks |
When Sonnet Beats Opus
- Scaled coding & agents — Sonnet handles the majority of real coding and agent-orchestration work at ~60% of Opus's cost.
- Desktop/computer automation — strong computer-use scores without the flagship price.
- High-volume knowledge work — summarization, drafting, analysis where Opus is overkill.
The rule of thumb: default to Sonnet, escalate to Opus only for the hardest 5–10% of tasks. That tiered pattern is the biggest cost lever in any Claude deployment — see how to reduce AI API costs.
When You Still Want Opus
- Correctness-critical reasoning where a wrong answer is expensive.
- The most demanding long-horizon agent runs.
- Nuanced judgment at the very top of the difficulty curve.
For cheaper still, Claude Haiku 4.5 ($1/$5) handles simple, high-volume tasks.
How to Call It
curl -X POST https://api.linkmodel.ai/api/v1/... \
-H "Authorization: Bearer $LINKMODEL_API_KEY" -H "Content-Type: application/json" \
-d '{ "model": "claude-sonnet-4-6", "messages": [{"role":"user","content":"Draft a migration plan for this service: ..."}] }'Confirm the exact chat endpoint and schema in the docs. Keep a stable prompt prefix to capture the ~90% cache discount.
Sonnet vs the Field
At $3/$15, Sonnet undercuts GPT-5.5 ($5/$30) and sits above Gemini 2.5 Pro ($1.25/$10) and far above DeepSeek V4 Flash ($0.14/$0.28) — buying Anthropic's judgment and coding quality at mid-tier price. Full comparison in Claude vs GPT vs Gemini vs DeepSeek and best LLM API.
Bottom Line
Claude Sonnet 4.6 is the default Claude for production: near-Opus quality, 40% cheaper, 1M context. Route the hardest tasks to Opus and the simplest to Haiku or DeepSeek.
Start free with a $1 credit and test Sonnet against Opus on your own workload.