Claude Opus 4.8 vs Kimi K2.6: pricing, Quality, Value, and benchmarks

Buyer access

Pricing, app access, and Conversation Value

• Humanity's Last Exam

  Normalized quality input

  49.8%

  Anthropic Claude Opus 4.8 release page | Vendor-reported Anthropic Opus 4.8 HLE no-tools score. Do not replace with tools-enabled or adaptive-effort HLE variants.

• SWE-Bench Pro

  Software engineering task resolution

  69.2%

  Anthropic Claude Opus 4.8 release page | Vendor-reported Anthropic Opus 4.8 SWE-Bench Pro score. Do not substitute SWE-Bench Verified.

• Humanity's Last Exam

  Normalized quality input

  18.2%

  Artificial Analysis - Humanity's Last Exam evaluation | Third-party benchmark evaluation page used only after the official HLE leaderboard sources fail to yield a usable result.

• SWE-Bench Pro

  Software engineering task resolution

  58.6%

  Moonshot AI Kimi K2.6 model-card eval results | Moonshot AI Kimi K2.6 model-card eval result file. Result is vendor-published and should display with source provenance. Retained from the previous published snapshot because the current live source did not expose this benchmark row. Retained from the previous published snapshot because the current live source did not expose this benchmark row. Retained from the previous published snapshot because the current live source did not expose this benchmark row.

• Terminal-Bench 2.0

  Agentic terminal task completion

  66.7%

  Moonshot AI Kimi K2.6 model-card eval results | Moonshot AI Kimi K2.6 model-card eval result file for harborframework/terminal-bench-2.0. Result is vendor-published and should display with source provenance. Retained from the previous published snapshot because the current live source did not expose this benchmark row. Retained from the previous published snapshot because the current live source did not expose this benchmark row. Retained from the previous published snapshot because the current live source did not expose this benchmark row.

Claude Opus 4.8 is Anthropic's newest Opus model, strongest for coding, agentic tasks, and complex professional work where the vendor-reported benchmark evidence applies.

Claude Opus 4.8 is under active editorial review. Current public ranking data is limited to accepted source/fact evidence for benchmarks, pricing, and context rather than AI-generated score changes.

The strongest open-source coding model in the current roster, best for teams that want frontier-level development work at far lower API cost.

Released April 20, 2026, Kimi K2.6 is an open-source Moonshot AI model built for coding and autonomous task execution rather than general-purpose chat. Its best fit is teams that want near-flagship coding performance without flagship pricing. At $0.95 per million uncached input tokens and $4.00 per million output tokens, with cheaper cached input available, it gives cost-sensitive engineering teams a serious alternative to proprietary coding models. The tradeoff is polish: creative writing trails Claude and ChatGPT, English and Chinese are stronger than other languages, and response speed is slow compared with the fastest frontier options. It is also operated by a Chinese company under local data regulations, so government, defense, and heavily regulated teams should review compliance before sending sensitive work. Bottom line: Kimi K2.6 is a compelling Claude or GPT alternative for development work when cost efficiency matters more than raw polish.