Kimi K2 Thinking is $2.4 cheaper per 1M input tokens (80% lower; 5x difference).
API cost decision in 10 seconds
Claude Sonnet 4.6 vs Kimi K2 Thinking
Pick Kimi K2 Thinking for lower cost; pick Claude Sonnet 4.6 only if the larger context window matters more.
Pricing data updated:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick Kimi K2 Thinking for lower cost; pick Claude Sonnet 4.6 only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Kimi K2 Thinking is estimated at $1.85 vs $10.5 for Claude Sonnet 4.6, saving $8.65 (82.4% lower).
Cost-first pickKimi K2 Thinking
Context-first pickClaude Sonnet 4.6
Sample savings$8.6582.4%
10x traffic gap$86.5
Claude Sonnet 4.6 has more context, but Kimi K2 Thinking saves $8.65 on the standard workload. At 10x that traffic, the same price gap is about $86.5. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Kimi K2 Thinking stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Claude Sonnet 4.6 | Kimi K2 Thinking |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Kimi K2 Thinking | $22.5 | $4.25 |
| Balanced workload | 1M input + 1M output | Kimi K2 Thinking | $18 | $3.1 |
| Output-heavy chatbot | 1M input + 5M output | Kimi K2 Thinking | $78 | $13.1 |
Kimi K2 Thinking is $12.5 cheaper per 1M output tokens (83.3% lower; 6x difference).
Claude Sonnet 4.6 has 737.86K more context (3.81x larger).
Kimi K2 Thinking is $8.65 cheaper on the standard workload (82.4% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
Kimi K2 Thinking has the lower input price; Kimi K2 Thinking has the lower output price; Claude Sonnet 4.6 offers the larger context window. For the 1M input plus 500K output sample, Kimi K2 Thinking is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $10.5 for Claude Sonnet 4.6 and $1.85 for Kimi K2 Thinking.
Choose Claude Sonnet 4.6 when you care most about larger context window.
Choose Kimi K2 Thinking when you care most about lower input-token price, and lower output-token price.
- On the standard 1M input plus 500K output workload, Kimi K2 Thinking is estimated at $1.85 vs $10.5 for Claude Sonnet 4.6, saving $8.65 (82.4% lower).
- Kimi K2 Thinking is $8.65 cheaper on the standard workload (82.4% lower).
- Kimi K2 Thinking is $2.4 cheaper per 1M input tokens (80% lower; 5x difference).
- Kimi K2 Thinking is $12.5 cheaper per 1M output tokens (83.3% lower; 6x difference).
- Claude Sonnet 4.6 has 737.86K more context (3.81x larger).
| Feature | Claude Sonnet 4.6 (Anthropic) | Kimi K2 Thinking (MoonshotAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $3 | $0.6 |
| Completion Price per 1M tokens | $15 | $2.5 |
| Sample Workload Cost 1M input + 500K output | $10.5 | $1.85 |
| Context Window | 1M | 262.14K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Kimi K2 Thinking | On the standard 1M input plus 500K output workload, Kimi K2 Thinking is estimated at $1.85 vs $10.5 for Claude Sonnet 4.6, saving $8.65 (82.4% lower). |
| High-volume input processing | Kimi K2 Thinking | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Kimi K2 Thinking | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Claude Sonnet 4.6 | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Claude 3 Haiku can replace Claude Sonnet 4.6 when lower sample workload cost matters most: $0.88.
- Claude 3.5 Haiku can replace Claude Sonnet 4.6 when lower sample workload cost matters most: $2.8.
- Anthropic Claude Haiku Latest can replace Claude Sonnet 4.6 when lower sample workload cost matters most: $3.5.
- Claude Haiku 4.5 can replace Claude Sonnet 4.6 when lower sample workload cost matters most: $3.5.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- GPT-5.4 offers 1.05M context with $10 sample workload cost.
- No popular competitor is currently available.
Cheaper alternatives
Review low-cost models sorted by a standard 1M input plus 500K output workload.
Open cheapest modelsLarger context alternatives
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Open provider hubsAnthropic catalog
Review all tracked Anthropic models before deciding whether this matchup is the right shortlist.
Open Anthropic modelsMoonshotAI catalog
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