LLM Reference

Claude Opus 4.8 vs Kimi K2.6

Claude Opus 4.8 (2026) and Kimi K2.6 (2026) compare a standalone API model against a coding-specialized model. Claude Opus 4.8 ships a 1m-token context window, while Kimi K2.6 ships a 262k-token context window. On SWE-bench Verified, Claude Opus 4.8 leads by 8.4 pts. On pricing, Kimi K2.6 costs $0.73/1M input tokens versus $5/1M for the alternative. This page treats the result as workflow and deployment fit, not a universal model winner.

Treat this as a product-type comparison: Claude Opus 4.8 is standalone API model, while Kimi K2.6 is coding-specialized model. Choose based on workflow fit before reading any benchmark or price row as decisive.

Decision scorecard

Local evidence first
SignalClaude Opus 4.8Kimi K2.6
Product typeStandalone API modelCoding-specialized model
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentscustom coding agents, code generation, and tool loops
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window1m262k
Cheapest output$25/1M tokens$3.49/1M tokens
Provider routes6 tracked9 tracked
Shared benchmarksSWE-bench Verified leader12 shared

Decision tradeoffs

Choose Claude Opus 4.8 when...
  • Claude Opus 4.8 holds a shared-benchmark lead on SWE-bench Verified, ahead by 8.4 points.
  • Claude Opus 4.8 has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Claude Opus 4.8 uniquely exposes Code execution, Computer use, and Parallel agents in local model data.
  • Local decision data tags Claude Opus 4.8 for Coding, RAG, and Agents.
Choose Kimi K2.6 when...
  • Kimi K2.6 holds a shared-benchmark lead on LiveCodeBench, ahead by 0.8 points.
  • Kimi K2.6 has the lower cheapest tracked output price at $3.49/1M tokens.
  • Kimi K2.6 has broader tracked provider coverage for fallback and route flexibility.
  • Local decision data tags Kimi K2.6 for Coding, RAG, and Agents.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Kimi K2.6

Claude Opus 4.8

$10,250

Cheapest tracked route/tier: Anthropic

Kimi K2.6

$1,457

Cheapest tracked route/tier: OpenRouter

Estimated monthly gap: $8,794. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude Opus 4.8 -> Kimi K2.6
  • Provider overlap exists on OpenRouter, Microsoft Foundry, and Vercel AI Gateway; start route-level A/B tests there.
  • Kimi K2.6 is $21.51/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Code execution, Computer use, and Parallel agents before moving production traffic.
Kimi K2.6 -> Claude Opus 4.8
  • Provider overlap exists on Microsoft Foundry, OpenRouter, and Vercel AI Gateway; start route-level A/B tests there.
  • Claude Opus 4.8 is $21.51/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Claude Opus 4.8 adds Code execution, Computer use, and Parallel agents in local capability data.

Specs

Specification
Released2026-05-282026-04-20
Context window1m262k
Parameters—1T
ArchitectureDecoder OnlyMixture of Experts
LicenseProprietaryMITOSI-approved
OpennessProprietaryOpen source
WeightsNot releasedAvailable·Moonshot Modified MIT License
CodeNot releasedAvailable·Moonshot Modified MIT License
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff2026-012025-04

Pricing and availability

Pricing attributeClaude Opus 4.8Kimi K2.6
Input price$5/1M tokens$0.73/1M tokens
Output price$25/1M tokens$3.49/1M tokens
Providers
AnthropicAWS BedrockGCP Vertex AIMicrosoft FoundryOpenRouterVercel AI Gateway
Cloudflare Workers AINVIDIA NIMMoonshot AI KimiFireworks AIOpenRouterMicrosoft Foundry

Capabilities

CapabilityClaude Opus 4.8Kimi K2.6
VisionYesYes
MultimodalYesYes
ReasoningYesYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesNo
IDE integrationNoNo
Computer useYesNo
Parallel agentsYesNo

Benchmarks

BenchmarkClaude Opus 4.8Kimi K2.6
SWE-bench Verified88.680.2
SWE-bench Pro69.258.6
Google-Proof Q&A93.690.5
LiveCodeBench88.889.6
MCP-Atlas82.255.9
CursorBench63.847.6
CursorBench62.347.6
CursorBench59.447.6
GeneBench-Pro16.04.4
CursorBench58.047.6
CursorBench56.147.6
CursorBench53.147.6

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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.