Standard Compute
Model comparison 2026

Claude Opus 5.5 vs Kimi K2.6

Claude Opus 5.5
Anthropic · Frontier · Proprietary
$8.80/1M · 1M ctx
Kimi K2.6
Moonshot AI · Frontier · Open weights
$1.48/1M · 262K ctx

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality
Correctness and depth of what it produces
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
Speed
Tokens per second and time-to-first-token
Value for money
How much capability you get per dollar
Reliability
Consistent results: fewer refusals, loops and format breaks

Specs and pricing side by side

Spec
Opus 5.5
Kimi K2.6
Maker
Anthropic
Moonshot AI
Blended price / 1M
$8.80
$1.48
Input / output
$4.00 in · $20 out / 1M tokens
$0.65 in · $3.41 out / 1M tokens
Context window
1M
262K
Open weights
No
Yes
Tool use
Yes
Yes
Reasoning
Yes
Yes
Output Quality
10.0
8.6
Agentic Ability
10.0
8.8
Speed
7.6
7.6
Value for money
7.4
9.2
Reliability
9.5
9.0

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: Opus 5.5 or Kimi K2.6?

Updated 2026-10-13

Choose Claude Opus 5.5 if you want the hardest coding and agent work, as the default flagship instead of Fable. Choose Kimi K2.6 if you want a flagship-feel open-weight generalist.

In our editorial scoring, Claude Opus 5.5 leads in 3 of five dimensions (output quality, agentic ability and reliability), while Kimi K2.6 leads in 1. On price, Claude Opus 5.5 runs about $8.80 per 1M tokens (blended) and is proprietary; Kimi K2.6 is about $1.48 and open-weight.

Where Opus 5.5 falls short
  • Twice Sonnet 5.5's price per token for a small measured gain
  • Released September 2026, so its long-run track record is still short
Full Opus 5.5 breakdown →
Where Kimi K2.6 falls short
  • A step behind the closed flagships
  • Pricier than the cheapest open models
Full Kimi K2.6 breakdown →

The agent matters as much as the model. Compare AI agents →

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Current frontier models Claude Opus 5.5 · Claude Sonnet 5.5

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