Kimi K2.5 is the strongest open-weight challenge to ChatGPT on its own turf: natively multimodal (including video), frontier coding at 76.8% SWE-bench Verified, and an API at $0.60/$2.50 per million tokens. ChatGPT still delivers the more complete product experience and audio support. As a developer platform, K2.5's open weights and price make it the aggressive choice; as an end-user assistant, ChatGPT keeps the crown.
Kimi K2.5 vs ChatGPT at a glance
| Kimi K2.5 | ChatGPT | |
|---|---|---|
| Vendor | Moonshot AI (China) | OpenAI (United States) |
| Open weights | Yes — downloadable | No |
| License | Modified MIT — free commercial use; attribution required above 100M monthly active users or $20M monthly revenue | Proprietary — API and subscription access only; no weights |
| Parameters | 1T (32B active) | Undisclosed |
| Context window | 256K tokens | — |
| Modalities | text, image, video | text, image, audio |
| Pricing | $0.60 in / $2.50 out per 1M tokens | Subscription tiers (free / Plus / Pro / Team / Enterprise) plus per-token API pricing that runs well above open-weight equivalents; GPT-5.5 is the flagship tier as of July 2026. |
| Released | 2026-01-27 | — |
Specs and pricing verified July 2026.
About Kimi K2.5
Kimi K2.5 is Moonshot AI's trillion-parameter multimodal agent model, released January 27, 2026. Built by continual-pretraining on ~15 trillion mixed visual and text tokens on top of the Kimi-K2 base, it natively understands text, images, and video, activates 32B parameters per token, and ships both instant and thinking modes.
Its defining feature is agentic: K2.5 introduced Agent Swarm, coordinating up to 100 specialized agents on a single task, and posted 76.8% on SWE-bench Verified — frontier-class coding from an open-weight release. The Modified MIT license is effectively free for everyone below 100M monthly users or $20M monthly revenue, at which point attribution (not payment) kicks in.
Full specs, benchmarks, and hardware guidance: the Kimi K2.5 page.
About ChatGPT
ChatGPT is OpenAI's proprietary flagship product, powered by the GPT-5.x series (GPT-5.5 as of mid-2026). It defines the consumer AI experience — multimodal, deeply productized, with the largest user base in the industry.
You cannot download, self-host, fine-tune on-premise, or audit its weights: access is exclusively through OpenAI's subscription products and API. That is the axis on which every open-weight comparison turns — capability parity has narrowed to single digits on everyday work, while cost, control, and data-residency differences remain structural.
Choosing between them
Choose Kimi K2.5 for:
- Multimodal agents that need vision and video, not just text
- Frontier coding (76.8% SWE-bench Verified) on open weights
- Multi-agent orchestration workloads (Agent Swarm)
Frequently asked questions
Is Kimi K2.5 better than ChatGPT?
Kimi K2.5 is the strongest open-weight challenge to ChatGPT on its own turf: natively multimodal (including video), frontier coding at 76.8% SWE-bench Verified, and an API at $0.60/$2.50 per million tokens. ChatGPT still delivers the more complete product experience and audio support. As a developer platform, K2.5's open weights and price make it the aggressive choice; as an end-user assistant, ChatGPT keeps the crown.
Which is cheaper: Kimi K2.5 or ChatGPT?
Kimi K2.5: $0.60 in / $2.50 out per 1M tokens. ChatGPT: Subscription tiers (free / Plus / Pro / Team / Enterprise) plus per-token API pricing that runs well above open-weight equivalents; GPT-5.5 is the flagship tier as of July 2026.. As an open-weight model, Kimi K2.5 can also be self-hosted, which caps cost at your own hardware.
Can I self-host Kimi K2.5 and ChatGPT?
Kimi K2.5: yes — weights are published under Modified MIT. ChatGPT: no — it is a proprietary service with no downloadable weights.