Models, measured side by side
Claude Opus 5.5 vs Kimi K3
Compare Claude Opus 5.5, Kimi K3 by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
Claude Opus 5.5
$180 / mo
Kimi K3
$122 / mo
Performance comparison
Claude Opus 5.5
57.6
Kimi K3
43.6
Overview
| Overview | Claude Opus 5.5 | Kimi K3 |
|---|---|---|
| Provider | Anthropic | MoonshotAI |
| Released | 2026-09-22 | 2026-07-16 |
| Status | Active | Active |
| Input formats | textimagefile | textimagevideo |
| Output formats | text | text |
Provider
- Claude Opus 5.5
- Anthropic
- Kimi K3
- MoonshotAI
Released
- Claude Opus 5.5
- 2026-09-22
- Kimi K3
- 2026-07-16
Status
- Claude Opus 5.5
- Active
- Kimi K3
- Active
Input formats
- Claude Opus 5.5
- textimagefile
- Kimi K3
- textimagevideo
Output formats
- Claude Opus 5.5
- text
- Kimi K3
- text
Pricing & capacity
| Pricing & capacity | Claude Opus 5.5 | Kimi K3 |
|---|---|---|
| Input / 1M tokens | $4.00 | $3.00 |
| Output / 1M tokens | $20 | $12 |
| Cached input / 1M | $0.20 | $0.43 |
| Monthly cost | $180 | $122 |
| Context window | 1M | 1M |
| Maximum output | 128K | 944K |
Input / 1M tokens
- Claude Opus 5.5
- $4.00
- Kimi K3
- $3.00
Output / 1M tokens
- Claude Opus 5.5
- $20
- Kimi K3
- $12
Cached input / 1M
- Claude Opus 5.5
- $0.20
- Kimi K3
- $0.43
Monthly cost
- Claude Opus 5.5
- $180
- Kimi K3
- $122
Context window
- Claude Opus 5.5
- 1M
- Kimi K3
- 1M
Maximum output
- Claude Opus 5.5
- 128K
- Kimi K3
- 944K
Benchmarks & performance
| Benchmarks & performance | Claude Opus 5.5 | Kimi K3 |
|---|---|---|
| Intelligence Index | 57.6 | 43.6 |
| GPQA | Not listed | 93.5% |
| Humanity’s Last Exam | 61.4% | 46.9% |
| SciCode | 66.9% | 59.5% |
| Output speed | 91 tokens/s | 45 tokens/s |
| Time to first token | 755.54 s | 3.83 s |
| DesignArena rating | 1,407 | 1,368 |
| DesignArena win rate | 65.3% | 63.1% |
Intelligence Index
- Claude Opus 5.5
- 57.6
- Kimi K3
- 43.6
GPQA
- Claude Opus 5.5
- Not listed
- Kimi K3
- 93.5%
Humanity’s Last Exam
- Claude Opus 5.5
- 61.4%
- Kimi K3
- 46.9%
SciCode
- Claude Opus 5.5
- 66.9%
- Kimi K3
- 59.5%
Output speed
- Claude Opus 5.5
- 91 tokens/s
- Kimi K3
- 45 tokens/s
Time to first token
- Claude Opus 5.5
- 755.54 s
- Kimi K3
- 3.83 s
DesignArena rating
- Claude Opus 5.5
- 1,407
- Kimi K3
- 1,368
DesignArena win rate
- Claude Opus 5.5
- 65.3%
- Kimi K3
- 63.1%
Tools & features
| Tools & features | Claude Opus 5.5 | Kimi K3 |
|---|---|---|
| Function calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Log probabilities | Not listed | Supported |
| Deterministic seed | Not listed | Supported |
| Prompt caching | Supported | Supported |
Function calling
- Claude Opus 5.5
- Supported
- Kimi K3
- Supported
Structured outputs
- Claude Opus 5.5
- Supported
- Kimi K3
- Supported
JSON mode
- Claude Opus 5.5
- Supported
- Kimi K3
- Supported
Reasoning
- Claude Opus 5.5
- Supported
- Kimi K3
- Supported
Log probabilities
- Claude Opus 5.5
- Not listed
- Kimi K3
- Supported
Deterministic seed
- Claude Opus 5.5
- Not listed
- Kimi K3
- Supported
Prompt caching
- Claude Opus 5.5
- Supported
- Kimi K3
- Supported
API & availability
| API & availability | Claude Opus 5.5 | Kimi K3 |
|---|---|---|
| API identifier | claude-opus-5.5 | kimi-k3 |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- Claude Opus 5.5
claude-opus-5.5- Kimi K3
kimi-k3
Prices checked
- Claude Opus 5.5
- Oct 8, 2026
- Kimi K3
- Oct 8, 2026
About the models
Claude Opus 5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
Full pricing & detailsKimi K3
Kimi K3 is a 2.8T parameter open-weight multimodal reasoning model from Moonshot AI. It is suited for complex coding, knowledge work, and long-horizon agentic workflows, and is particularly strong at...
Full pricing & detailsComparison FAQ
Claude Opus 5.5: $4.00 input and $20 output per million tokens. Kimi K3: $3.00 input and $12 output per million tokens. The cheaper choice depends on your input-to-output ratio; a model can have a lower input rate but a higher output rate.