Claude Opus 5 vs Kimi K3
API pricing, context window and capabilities for Claude Opus 5 and Kimi K3, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Opus 5 wins on Terminal-Bench and on intelligence. Kimi K3 wins on price.
Price
Kimi K3
Terminal-Bench
Claude Opus 5
Intelligence
Claude Opus 5
Context window
Tied
Key takeaways
who wins on what, from the published numbersClaude Opus 5 wins
- Has web search
Kimi K3 wins
- Cheaper input ($5.00 vs $0.70 /1M)
- Cheaper output ($25.00 vs $12.50 /1M)
- Higher max output (128K vs 1M)
- More serving providers (9 vs 14)
Cheaper overall
Kimi K3
$0.70 + $12.50 /1M
Larger context
Tied
More providers
Kimi K3
14 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.
| Claude Opus 5 | Kimi K3 | |
|---|---|---|
| Input $/1M | $5.00via Anthropic | $0.70OpenRouter routed quote best |
| Output $/1M | $25.00via Anthropic | $12.50via Sail best |
| Context window | 1M | 1M |
| Max output | 128K | 1M best |
| Serving providers | 9 | 14 best |
| Date | Released Jul 24, 2026 | Released Jul 16, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Opus 5 | Kimi K3 | |
|---|---|---|
| Intelligence | 50.8 best | 43.6 |
| Terminal-Bench | 89% best | 85% |
| GPQA Diamond | 93% | 94% best |
| Output speed | 56 t/s best | 45 t/s |
| Latency (TTFT) | 107.27s | 3.17s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Opus 5
via OpenRouter
$50
Kimi K3
via OpenRouter
$19
Capabilities
feature support, side by side| Feature | Claude Opus 5 | Kimi K3 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Opus 5 or Kimi K3?
Kimi K3 is cheaper for input ($5.00 vs $0.70 per 1M tokens) as an OpenRouter routed quote, while Moonshot lists it at $3.00 per 1M input. Kimi K3 is cheaper for output ($25.00 vs $12.50 per 1M tokens) from Sail.
What is the context window difference between Claude Opus 5 and Kimi K3?
Both Claude Opus 5 and Kimi K3 have about a 1M-token context window.
How do Claude Opus 5 and Kimi K3 compare on benchmarks?
On the tracked benchmarks, Claude Opus 5 leads on Terminal-Bench, and Claude Opus 5 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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