AI model comparison
Kimi K3.1 Pro vs Claude Opus 5.5
Side by side comparison of Kimi K3.1 Pro and Claude Opus 5.5 on pricing, benchmark scores, context window, and more.
Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model and a post-trained successor to Kimi K3, with a 1M-token context window.
- Input / 1M
- $2
- Output / 1M
- $10
- Context
- 1.05M
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
- Input / 1M
- $4
- Output / 1M
- $20
- Context
- 1M
Comparing image generators? Compare image models
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Kimi K3.1 Pro
2x cheaper for a typical chat
Higher intelligence score
Claude Opus 5.5
57.6 vs 55.1 on Artificial Analysis
Larger context window
Kimi K3.1 Pro
1.05M vs 1M tokens
Newer release
Kimi K3.1 Pro
Released October 23, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Opus 5.557.6Coding index
Claude Opus 5.5Not availableAgentic index
Claude Opus 5.5Not availablePricing
Kimi K3.1 Pro vs Claude Opus 5.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Opus 5.5 | |
|---|---|---|
| Input tokensPer 1M tokens | $2 | $4 |
| Output tokensPer 1M tokens | $10 | $20 |
| Cached input (read)Per 1M tokens | $0.20 | $0.20 |
| Cache writePer 1M tokens | Not available | $5 |
| Web searchPer request | Not available | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Claude Opus 5.5$18Coding task
30K in, 4K out
Claude Opus 5.5$200$86 cachedLong document summary
150K in, 2K out
Claude Opus 5.5$640$70 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Claude Opus 5.5 | |
|---|---|---|
| Context window | 1.05M tokens | 1M tokens |
| Max output | 944K tokens | 128K tokens |
| Input types | Image, Text, Video | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Max, High, Low, None | Max, Extra high, High, Medium, Low |
| Default reasoning effort | Max | High |
| Release date | October 23, 2026 | September 22, 2026 |
Features
Supported features
API features available for each model.
| Metric | Claude Opus 5.5 | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Not supported | Not supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Not supported | Not supported |
| Verbosity control | Not supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- Kimi K3.1 Pro vs Claude Sonnet 5.5
- Kimi K3.1 Pro vs Claude Fable 5.1
- Kimi K3.1 Pro vs GPT-6 Astra
- Kimi K3.1 Pro vs Gemini 4 Argon
- Kimi K3.1 Pro vs GPT-6.1 Sol
- Kimi K3.1 Pro vs Claude Opus 5
- Kimi K3.1 Pro vs Claude Fable 5
- Kimi K3.1 Pro vs Muse Spark 1.3
- Kimi K3.1 Pro vs GPT-6 Sol
- Kimi K3.1 Pro vs Grok 4.7
- Kimi K3.1 Pro vs Kimi K3
- Kimi K3.1 Pro vs GLM 5.3 Flash
- Kimi K3.1 Pro vs DeepSeek V4.1 Flash 1017
- Kimi K3.1 Pro vs MiMo-V2.6-Flash
- Kimi K3.1 Pro vs DeepSeek V4.1 Flash
- Kimi K3.1 Pro vs Hy4 preview
Claude Opus 5.5View full model details- Claude Opus 5.5 vs Claude Sonnet 5.5
- Claude Opus 5.5 vs Claude Fable 5.1
- Claude Opus 5.5 vs DeepSeek V4.1 Flash 1017
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Opus 5.5 vs DeepSeek V4.1 Flash
- Claude Opus 5.5 vs Gemini 4 Argon
- Claude Opus 5.5 vs GLM 5.3 Flash
- Claude Opus 5.5 vs GPT-6.1 Sol
- Claude Opus 5.5 vs Hy4 preview
- Claude Opus 5.5 vs Claude Opus 5
- Claude Opus 5.5 vs Claude Fable 5
- Claude Opus 5.5 vs MiMo-V2.6-Flash
- Claude Opus 5.5 vs Muse Spark 1.3
- Claude Opus 5.5 vs GPT-6 Luna
- Claude Opus 5.5 vs GPT-6 Sol
- Claude Opus 5.5 vs GPT-5.6 Sol
- Claude Opus 5.5 vs GLM 5.3
- Claude Opus 5.5 vs Grok 4.7
- Claude Opus 5.5 vs DeepSeek V4 Flash 0731
- Claude Opus 5.5 vs Hy3
- Claude Opus 5.5 vs Muse Spark 1.3 Contributor
- Claude Opus 5.5 vs DeepSeek V4 Flash 0423
- Claude Opus 5.5 vs Gemini 3.1 Pro Preview
- Claude Opus 5.5 vs Muse Wonder
Our take
Kimi K3.1 Pro is 2x cheaper for a typical chat. Claude Opus 5.5 scores higher on the Artificial Analysis Intelligence Index (57.6 vs 55.1). Kimi K3.1 Pro has the larger context window (1.05M vs 1M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Kimi K3.1 Pro or Claude Opus 5.5 cheaper?
Kimi K3.1 Pro is cheaper for a typical chat (2K input tokens and 500 output tokens). Kimi K3.1 Pro costs $2 per 1M input tokens and $10 per 1M output tokens, while Claude Opus 5.5 costs $4 per 1M input tokens and $20 per 1M output tokens.
Which has a bigger context window, Kimi K3.1 Pro or Claude Opus 5.5?
Kimi K3.1 Pro supports up to 1.05M tokens of context, compared with 1M for Claude Opus 5.5.
Is Kimi K3.1 Pro smarter than Claude Opus 5.5?
On the Artificial Analysis Intelligence Index, Kimi K3.1 Pro scores 55.1 and Claude Opus 5.5 scores 57.6, putting Claude Opus 5.5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Kimi K3.1 Pro and Claude Opus 5.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Kimi K3.1 Pro and Claude Opus 5.5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Kimi K3.1 Pro and Claude Opus 5.5 at the same time. Compare the answers side by side and keep the best one.