GPT-5.4 vs Kimi K2.6: pricing, Quality, Value, and benchmarks

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Pricing, app access, and ease of use

• Humanity's Last Exam

  Normalized quality input

  41.6%

  Third-party HLE evaluation page | Third-party HLE evaluation page. This row reflects the GPT-5.4 (xhigh) result.

• GPQA Diamond

  Normalized quality input

  92.0%

  Artificial Analysis — GPT-5.4 evaluation | HLE (41.6%) and GPQA Diamond (92.0%) from Artificial Analysis independent evaluation. SWE-bench Verified estimated from third-party evaluation (vals.ai); OpenAI published SWE-bench Pro at 57.7% — a harder variant not directly comparable with this roster. MRCR scores estimated from independent context-window evaluation data. Pricing confirmed from OpenAI API docs.

• SWE-Bench Pro

  Software engineering task resolution

  57.7%

  OpenAI GPT-5.4 launch page | Official OpenAI launch page. Result is vendor-reported for SWE-Bench Pro.

• Terminal-Bench 2.0

  Agentic terminal task completion

  81.8%

  Terminal-Bench 2.0 official leaderboard | Official Terminal-Bench 2.0 leaderboard row for ForgeCode + GPT-5.4; accuracy 81.8% +/- 2.0.

• Humanity's Last Exam

  Normalized quality input

  35.9%

  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.

Choose this when you need an AI that can operate software and complete professional tasks autonomously, not just advise on them.

GPT-5.4 is one of the best choices for people who want an AI that feels smart, reliable, and easy to use without needing technical knowledge. Compared with many other AI models, it stands out for its stronger reasoning, better memory in longer conversations, more natural replies, and broader ability to help with real everyday tasks. Whether you need help writing, researching, planning, summarising documents, solving problems, or getting organised, GPT-5.4 does all of it in one place at a very high level. It is not just for asking questions - it can also help take action and support more advanced workflows when needed. If you want a premium all-round AI assistant that is polished, versatile, and useful for both personal and professional life, GPT-5.4 is a compelling option and one of the safest buys in the market.

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.