AI model · Anthropic
Claude Opus 5.5
Anthropic released Claude Opus 5.5 on 22 Sep 2026. API list price: $4.00 per million input tokens and $20.00 per million output tokens. It is not on Claude’s free plan.
Released
22 Sep 2026
Available on every platform from launch The lab’s announcement
API list price, per million tokens
$4.00 in $20.00 out
Base input tokens. Cached input $0.20.
Anthropic’s pricing page, read 23 Oct 2026
On the free plan?
Not included
Current Claude pricing marks Opus as unavailable on Free. Source
The Access Gap, checked 3 Oct 2026
Anthropic’s other recent models
data through 30 Oct 2026
- 7 Oct 2026 Claude Haiku 5.5 Fast tier refresh, tuned for high-volume and latency-sensitive work
- 28 Sep 2026 Claude Sonnet 5.5 Mid-tier model at $2 in and $10 out, on every platform from launch
- 1 Sep 2026 Claude Mythos 5.1 Restricted sibling of Fable 5.1 for vetted cyberdefence and life-science organisations
- 1 Sep 2026 Claude Fable 5.1 Generally available; its sibling Mythos 5.1 stayed partner-only
- 24 Jul 2026 Claude Opus 5 Opus-line generational: near-Fable-5 intelligence at half the price
- 30 Jun 2026 Claude Sonnet 5 Sonnet-line generational: close to Opus 4.8 at a fraction of the price
- 17 Feb 2026 Claude Sonnet 4.6 Balanced tier upgrade; the default for Free and Pro on claude.ai, and on the API, from launch
- 29 Sep 2025 Claude Sonnet 4.5 Best agent value tier
Claude Opus 5.5 in Anthropic’s full release log · its row on the release chart
Release dates and notes come from the site’s release record, data through 30 Oct 2026; each links the lab’s own announcement. Prices are list prices as the lab’s pricing page printed them on the day shown, before any discount. Something wrong? Tell us.