Kimi K3.1 Pro vs Claude Sonnet 5.5
Kimi K3.1 Pro costs $2.00 / $10.00 and Claude Sonnet 5.5 costs $2.00 / $10.00 per million input / output tokens. At a typical 3:1 mix, Kimi K3.1 Pro is about the same price.
Input
$2.00
per 1M
Output
$10.00
per 1M
Cached
$0.20
1M context
Input
$2.00
per 1M
Output
$10.00
per 1M
Cached
$0.10
1M context
Side by side
✓ marks the cheaper price, larger context window, bigger discount or higher score.
| Detail | Kimi K3.1 Pro | Claude Sonnet 5.5 |
|---|---|---|
| Price per 1M tokens | ||
| Input | $2.00 | $2.00 |
| Output | $10.00 | $10.00 |
| Blended (3 in : 1 out) | $4.00 | $4.00 |
| Cached input | $0.20 | $0.10Lowest |
| Batch or off-peak discount | 40% (batch) | 50% (batch)Largest |
| Long prompts | Same rate at any length | Same rate at any length |
| Limits and model | ||
| Context window | 1M | 1M |
| Capability score Epoch AI index | — | 167 |
| Released | 23 Oct 2026 | 28 Sep 2026 |
| Open weights | No | No |
| Status | Current | Current |
| Checked | ||
| Price checked | 2 Nov 2026 Kimi API pricing | 22 Oct 2026 Anthropic pricing |
Monthly cost on three workloads
List prices, no batch discount. The cached share applies where a model has a cache rate.
| Workload | Kimi K3.1 Pro | Claude Sonnet 5.5 | Difference |
|---|---|---|---|
| Customer chat assistant50,000 conversations a month, about 2,000 tokens in and 400 out each; 50% cachedPrice this workload in the calculator | $310 | $305Lower | $5.00 |
| Document Q&A (RAG)20,000 questions a month over retrieved documents, 12,000 in and 600 out; 30% cachedPrice this workload in the calculator | $470 | $463Lower | $7.20 |
| Coding agent400 tasks a month, 40 steps each with a growing context; 85% cachedPrice this workload in the calculator | $433 | $369Lower | $63.75 |
How they differ
- Kimi K3.1 Pro accepts longer prompts (1M vs 1M tokens).
- Cached input is cheaper on Claude Sonnet 5.5 ($0.10 vs $0.20), which favours agents and chat apps that resend the same context.
Recent changes
All changes- Moonshot launched Kimi K3.1 Pro at $2 / $10 per 1M tokens, with cached input at $0.20, a third below Kimi K3's $3 / $15.
- Anthropic halved Claude Sonnet 5.5's cache-read price from $0.20 to $0.10 per 1M tokens; Anthropic says this cuts most agent workloads by about 20%.
- Claude Sonnet 5.5 replaced Sonnet 5 at the same $2 / $10 per 1M tokens, with cache reads at $0.20.
- Moonshot launched Kimi K3 at $3 / $15.
- ▼ 33%Anthropic launched Claude Sonnet 5 at $2 / $10, cheaper than Sonnet 4.6's $3 / $15.
$3 / $15→ $2 / $10
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