Claude Sonnet 4.6 vs DeepSeek-V4-Pro
Compare Claude Sonnet 4.6 and DeepSeek-V4-Pro on the metrics that decide an agent workload.
| Metric | Claude Sonnet 4.6 | DeepSeek-V4-Pro |
|---|---|---|
| Provider | Anthropic | Fireworks AI |
| Input / 1M | $3.00 | $1.74 |
| Output / 1M | $15.00 | $3.48 |
| Cache read / 1M | $0.30 (−90%) | $0.14 (−92%) |
| Reuse-adj @55% | $4.89 | $1.52 |
| Context | 1M | 1M |
| Cache capture | 91% | 80% |
| Warm TTFT | 190ms (−65%) | 130ms (−63%) |
| Quality index | 90 | 88 |
Teal marks the better value in each row. Reuse-adjusted assumes 55% prefix reuse and a 25% output share.
Pick Claude Sonnet 4.6 when it scores higher on the composite quality index, it captures more of the available reuse.
Pick DeepSeek-V4-Pro when it is cheaper once prefix reuse is priced in, it answers faster on warm cache hits, it is open-weights for on-prem and regulated lanes.
Claude Sonnet 4.6 leads on quality while DeepSeek-V4-Pro leads on reuse-adjusted cost. Send latency- and budget-sensitive volume to DeepSeek-V4-Pro and reserve Claude Sonnet 4.6 for the hard requests. Zumik's aliases route between them automatically under policy.
Claude Sonnet 4.6 vs DeepSeek-V4-Pro, answered.
Is Claude Sonnet 4.6 or DeepSeek-V4-Pro cheaper?
At 55% prefix reuse, Claude Sonnet 4.6 blends to about $4.89 per 1M tokens and DeepSeek-V4-Pro to about $1.52. DeepSeek-V4-Pro is cheaper on that basis.
Which has the larger context window?
Claude Sonnet 4.6 has the larger window: 1M vs 1M tokens.
Which captures more reuse?
Claude Sonnet 4.6 shows higher measured cache capture (91% vs 80%) in the Zumik corpus.
Let an alias pick for you.
Route to whichever model wins under current policy automatically. Zumik resolves the alias to the best fit per request, so you never hard-code a loser.