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Claude Opus 4.5 vs Kimi K3

Output tokens cost $25.00 per million on Claude Opus 4.5 and $15.00 per million on Kimi K3. Input tokens cost $5.00 per million on Claude Opus 4.5 and $3.00 per million on Kimi K3. Cached input tokens are billed at $0.50 per million on Claude Opus 4.5 and $0.30 per million on Kimi K3. Context lengths are 200,000 tokens on Claude Opus 4.5 and 1,048,576 tokens on Kimi K3. Time to first token (TTFT) measured on AIHubMix is 1.5s on Claude Opus 4.5 and 0.9s on Kimi K3. Measured output throughput is 43.9 tok/s on Claude Opus 4.5 and 73.1 tok/s on Kimi K3. On the LMArena coding leaderboard Claude Opus 4.5 scores 1523 and Kimi K3 scores 1531.

AnthropicClaude Opus 4.5Moonshot AIKimi K3
+ Add model · 2/4
Anthropic logo
Claude Opus 4.5
Anthropic · text, image → text

Claude Opus 4.5 is Anthropic’s latest frontier reasoning model, optimized for complex engineering, agentic workflows, and long-horizon computer use. It features strong multimodal capabilities, improved resistance to prompt injection, and a new Verbosity parameter to control token efficiency. With advanced tool use, extended context, and multi-agent support, Opus 4.5 excels in autonomous research, debugging, planning, and spreadsheet/browser operations. ⚠️ The minimum cache token for claude-opus-4-5 has been increased from 1,024 to 4,096 tokens.

Input$5.00 /M
Output$25.00 /M
Details
Moonshot AI logo
Kimi K3
Moonshot AI · text, image, video → text

Kimi K3 is Kimi’s flagship model for long-horizon coding and end-to-end knowledge work, with a 1M-token context window and industry-leading intelligence.

Input$3.00 /M
Output$15.00 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

Claude Opus 4.5
Kimi K3
Input /M
$5.00
$3.00
Output /M
$25.00
$15.00
Cache read /M
$0.50
$0.30
Context length
200,000
1,048,576
Max output
32,000
1,048,576
Time to First Token
1.5 s
0.9 s
Throughput
43.9 tok/s
73.1 tok/s
Modalities
textimage
textimagevideo
Supported Parameters
thinkingtoolsfunction callingstructured outputs
thinkingfunction callingstructured outputs
API Formats
Released
-
-

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

claude-opus-4-5kimi-k3

Tokens / day

-

Requests / day

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Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

claude-opus-4-5kimi-k3

Throughput (tok/s)

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TTFT (s)

-

Uptime (%)

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LMArena Benchmarks

LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.

Text
claude-opus-4-5kimi-k3
1440148015201560
Overall
14691486
Coding
15231531
Math
14661466
Hard prompts
14981505
Instruction following
14751479
Multi-turn
14841499
Creative writing
14611470
Longer query
14931502
Chinese
15011527
English
14791491

Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.

Cost calculator

Estimate your monthly bill for the same workload on each model.

Kimi K3
$405 /mo
Claude Opus 4.5
$675 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: Claude Opus 4.5, Kimi K3?

Kimi K3: $15.00/M output tokens; Claude Opus 4.5: $25.00/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Kimi K3: 1531; Claude Opus 4.5: 1523 (LMArena coding leaderboard).

Which responds faster?

Kimi K3: 0.9s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

Claude Opus 4.5 accepts 200,000 and Kimi K3 accepts 1,048,576 input tokens. Maximum output per request is 32,000 tokens on Claude Opus 4.5 and 1,048,576 tokens on Kimi K3.

Which one generates tokens faster?

Kimi K3 at 73.1 tok/s and Claude Opus 4.5 at 43.9 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

Claude Opus 4.5 accepts text and image input and supports thinking, tool calling, function calling and structured outputs; Kimi K3 accepts text, image and video input and supports thinking, function calling and structured outputs.

Can I call Claude Opus 4.5 and Kimi K3 with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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