Anthropic
10 models on AntSeed
Anthropic PBC is an American artificial intelligence company headquartered in San Francisco. Structured as a public benefit corporation, the lab develops large language models under the Claude name, with a research emphasis on building reliable, steerable, and safety-focused AI systems. Anthropic's catalog spans ten text models, all from the Claude family. The Opus line runs deep, from Claude Opus 4.5 (2025) through 4.6, 4.7, and 4.8 (2026), with "Fast" variants like Claude Opus 4.6 Fast and 4.8 Fast trading some depth for lower latency. The Sonnet tier — Claude Sonnet 4.5 and 4.6 — offers balanced mid-weight options. Sitting above them all is Claude Fable 5 (2026), the first publicly available model from Anthropic's top-tier Mythos class. The Opus, Sonnet, and Fable naming reflects Anthropic's tiered approach: Sonnet for everyday balance, Opus for deep reasoning, and the Mythos-class Fable as the most powerful model the lab has released to the public. All models are proprietary and accessed via API, positioning Anthropic as a frontier lab focused on capable, dependable assistants rather than open-weight releases.
| Model | Sellers↓ | From (input $/M) | From (output $/M) |
|---|---|---|---|
| claude-opus-4-8 | 22 | $0.82 | $4.10 |
| claude-opus-4-7 | 20 | $0.80 | $2.00 |
| claude-opus-4-6 | 17 | $0.08 | $0.25 |
| claude-sonnet-4-6 | 13 | $0.13 | $0.64 |
| claude-opus-4-5 | 9 | $0.82 | $4.10 |
| claude-sonnet-4-5 | 7 | $0.11 | $0.54 |
| claude-fable-5 | 7 | $1.60 | $8.20 |
| claude-opus-4-8-fast | 6 | $0.11 | $0.54 |
| claude-opus-4-6-fast | 6 | $7.26 | $36.35 |
| claude-opus-4-7-fast | 4 | $8.35 | $41.80 |