Claude Opus 4.8 vs Kimi K3
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Opus 4.8 | Kimi-K3 |
|---|---|---|
| ARC-AGI-1verified-v1-2aa739d957fc · verified_score · leader | 92.5098% of row best · percent · Claude Opus 4.8 (Max) | 94.50100% of row best · percent · Kimi K3 (Max) |
| ARC-AGI-2verified-v2-b5cb5ec6e8c7 · verified_score · leader | 72.08100% of row best · percent · Claude Opus 4.8 (High) | 60.4284% of row best · percent · Kimi K3 (Max) |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,451.9898% of row best · rating · claude-opus-4-8; 95% CI [1447.69484580, 1456.25837678]; votes 49123; rank 38 | 1,476.31100% of row best · rating · kimi-k3-max; 95% CI [1470.86166728, 1481.76254962]; votes 17895; rank 16 |
| LiveBench2026-06-25 · overall · leader | 81.18100% of row best · percent · claude-opus-4-8-max-effort · 24,171 output tokens / case | 81.02100% of row best · percent · kimi-k3 · 13,647 output tokens / case |
| ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader | 87.91100% of row best · points · Claude Opus 4.8 (max effort) · 2,741 output tokens / case | 88.19100% of row best · points · Kimi K3 · 15,023 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above | 2 benchmark wins | 3 benchmark winsOverall lead |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | Claude Opus 4.8 | Kimi-K3 |
|---|---|---|
| Developer | Anthropic | Moonshot AI |
| Family | Claude 4 8 | Kimi K3 |
| Model | Claude Opus 4.8 | Kimi-K3 |
| Version | Claude Opus 4.8 | Kimi-K3 |
| Lifecycle | active | active |
| Released | 2026-05-28 | 2026-07-16 |
| Knowledge cutoff | 2026-01-01 | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000K | 1,049K |
| Total parameters | Unknown | 2.8T |
| Active parameters | Unknown | 104B |
| License | Unknown | other |
| Open weights | No | Yes |
| API available | Yes | Yes |
| Self-hostable | No | Yes |
| Provider access | Anthropic (Standard), Deepinfra (Standard) | Deepinfra (Standard), Fireworks Ai (Standard), Hugging Face (Standard), Openrouter (Standard), Together Ai (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning |
14 comparable fields · 10 material differences · Pair passes the primary-source comparison gate
Claude Opus 4.8 Capabilities
Kimi K3 Capabilities
Internal Comparison Graph
Related Comparisons
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|---|---|---|---|
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 MiniMax-M3MiniMax | vs | Claude Opus 4.8Anthropic | cross-developer peersimage, text |
Claude Opus 4.8Anthropic | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Claude Opus 4.8Anthropic | vs |  Hy4 previewTencent | cross-developer peerstext |
Claude Opus 4.8Anthropic | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Claude Opus 4.8Anthropic | vs |  Mistral Large 3Mistral AI | cross-developer peersimage, text |
Claude Opus 4.8Anthropic | vs | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Opus 4.8 vs Kimi K3 FAQs
Is Claude Opus 4.8 or Kimi K3 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Opus 4.8 and Kimi K3, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Opus 4.8 or Kimi K3?+
Claude Opus 4.8 is $5.00 and Kimi K3 is $2.85 per million tokens, so Kimi K3 is cheaper on this metric. Claude Opus 4.8 is $25.00 and Kimi K3 is $14.25 per million tokens, so Kimi K3 is cheaper on this metric.
Which has a larger context window, Claude Opus 4.8 or Kimi K3?+
Kimi K3 has the larger sourced context window. Claude Opus 4.8 supports 1,000K and Kimi K3 supports 1,049K.
Which performs better in benchmarks, Claude Opus 4.8 or Kimi K3?+
Kimi K3 leads the current overall benchmark count. The result uses 5 protocol-matched benchmarks from 4 publishers; it is not a universal quality score.
Can Claude Opus 4.8 or Kimi K3 be self-hosted?+
Kimi K3 is the only model in this pair currently marked as self-hostable. Claude Opus 4.8 is not marked open weight; Kimi K3 is open weight.
Can Claude Opus 4.8 and Kimi K3 understand images?+
Claude Opus 4.8 is documented with image input; Kimi K3 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Opus 4.8 or Kimi K3?+
Neither has a larger sourced maximum output. Claude Opus 4.8 is 128K and Kimi K3 is —.
Do Claude Opus 4.8 and Kimi K3 support reasoning and tool use?+
Claude Opus 4.8: reasoning, tool calling, and image input. Kimi K3: reasoning and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Opus 4.8 or Kimi K3?+
Claude Opus 4.8 has 2 sourced provider routes; Kimi K3 has 5, so Kimi K3 has broader tracked availability.
Which offers better value, Claude Opus 4.8 or Kimi K3?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.