# Anthropic vs Moonshot AI

> Kimi K3 is the most capable open-weight model and scores close to Claude on SWE-bench Verified. Claude still ranks higher, and Anthropic's API is far easier to count on at scale.

Canonical: https://www.subconscious.dev/compare/anthropic-vs-moonshot-ai · By The Subconscious Team · Updated September 30, 2026

## How they compare

Independent testing puts these two close on coding. Vals AI scored Kimi K3 at 93.4% on SWE-bench Verified, fourth overall, behind Claude Opus 5, GPT-5.6 Sol and Claude Fable 5. So Claude keeps the edge, and Moonshot comes close at $3 in and $15 out against Fable 5.1's $10 in and $50 out. Both offer 1M context, and both models always think. K3 runs around 33 tokens per second and is verbose, while Fable is the slowest tier in Anthropic's lineup. Neither is the choice for latency.

The deeper difference is access. K3's full weights are on Hugging Face, so it can be fine-tuned or self-hosted, though that takes a 64+ accelerator cluster and a custom license that adds a commercial agreement above $20M in hosting revenue. Demand overran Moonshot's GPUs within days of launch, and new API subscriptions paused on July 19. Anthropic's closed models run on its own API and every major cloud. Pick Claude for dependable production coding agents. Pick K3 when open weights or lower list price outweigh a few points of benchmark score.

## What each one does

### Anthropic

Anthropic sells the Claude family of closed models through its own API, Amazon Bedrock, Google Vertex AI and Microsoft Foundry. The public lineup today runs from Claude Fable 5.1 at the top, released September 1, 2026, through the Opus and Sonnet tiers down to Haiku 4.5. List prices span a tenfold range, from $10 in and $50 out on Fable to $1 in and $5 out on Haiku. The top three tiers include a 1M token context window at standard pricing with no surcharge past 200K.

### Moonshot AI

Moonshot AI is the Beijing lab behind the Kimi models. Its flagship Kimi K3 launched July 16, 2026 as a 2.8 trillion parameter mixture-of-experts model that activates 16 of 896 experts per token, with native vision and a 1M token context. It is the first open model in the 3T class, and full weights landed on Hugging Face on July 27. The hosted API costs $3 in and $15 out per million tokens, with cached input at $0.30, and it runs through an OpenAI-compatible endpoint, Kimi Code in the terminal, OpenRouter and Cloudflare Workers AI.

## Which is best, and when

### Choose Anthropic for

- Production coding agents that need dependable API capacity
- The highest SWE-bench Verified results in this pair
- Procurement through Bedrock, Vertex AI or Foundry

### Choose Moonshot AI for

- Near-frontier coding at roughly a third of Fable's list price
- Teams that want open weights they can fine-tune
- Repo-scale and visual agents on a 1M window

## At a glance

| Attribute | Anthropic | Moonshot AI |
|---|---|---|
| Model access | Closed | Open weights, custom license |
| Flagship models | Claude Fable 5.1, Opus, Sonnet, Haiku 4.5 | Kimi K3, Kimi K2.6 |
| Speed | Fable is the slowest tier | ~33 tok/s on Kimi K3 |
| Price | $1–$10 in, $5–$50 out per 1M | $3 in, $15 out (Kimi K3) |
| Customization | N/A | Open weights to fine-tune |
| Deployment | API, Bedrock, Vertex AI, Microsoft Foundry | API, Kimi Code, OpenRouter |
| Long context | 1M, no surcharge past 200K | 1M |

## FAQ

### What is the difference between Anthropic and Moonshot AI?

Kimi K3 is the most capable open-weight model and scores close to Claude on SWE-bench Verified. Claude still ranks higher, and Anthropic's API is far easier to count on at scale.

### When should I choose Anthropic over Moonshot AI?

Production coding agents that need dependable API capacity; The highest SWE-bench Verified results in this pair; Procurement through Bedrock, Vertex AI or Foundry.

### When should I choose Moonshot AI over Anthropic?

Near-frontier coding at roughly a third of Fable's list price; Teams that want open weights they can fine-tune; Repo-scale and visual agents on a 1M window.

### Is Anthropic or Moonshot AI cheaper?

Anthropic: $1–$10 in, $5–$50 out per 1M. Moonshot AI: $3 in, $15 out (Kimi K3). The cheaper choice depends on the model and workload.

### Which has more context, Anthropic or Moonshot AI?

Anthropic: 1M, no surcharge past 200K. Moonshot AI: 1M.

## Running long-horizon agents?

If your agents run past 200K tokens, compare both against Subconscious: [Subconscious vs Anthropic](https://www.subconscious.dev/compare/subconscious-vs-anthropic.md), [Subconscious vs Moonshot AI](https://www.subconscious.dev/compare/subconscious-vs-moonshot-ai.md).

Full profiles: [Anthropic](https://www.subconscious.dev/providers/anthropic.md), [Moonshot AI](https://www.subconscious.dev/providers/moonshot-ai.md).