The Model Index
Models/Labs/Anthropic
Lab · 31 models · since Mar 2023

Anthropic

Anthropic has 31 models on The Model Index, from Claude (Mar 2023) to Claude Sonnet 5.5 (28 Sep 2026). Its strongest is Claude Opus 5.5, with an index score of 200 (GPT-4 = 100), rank 1 of 229. All are closed models.

31models tracked0 open · 31 closed
200index score of Claude Opus 5.5#1 of 229 models
28 Sep 2026latest releaseClaude Sonnet 5.5
8current versions23 replaced by newer ones

Every modelnewest first

ModelReleasedWeightsIndex scoreInput $/MOutput $/MContext
3Claude Sonnet 5.528 Sep 2026Closed
193
$2.0$101M
1Claude Opus 5.522 Sep 2026Closed
200
$4.0$201M
4Claude Fable 5.11 Sep 2026Closed
192
$10$501M
Claude Mythos 5.11 Sep 2026Closed
not scored yet
–––
5Claude Opus 5replaced24 Jul 2026Closed
187
$5.0$251M
22Claude Sonnet 5replaced30 Jun 2026Closed
169
$2.0$101M
6Claude Fable 5replaced9 Jun 2026Closed
185
$10$501M
Claude Mythos 5replaced9 Jun 2026Closed
not scored yet
–––
12Claude Opus 4.8replaced28 May 2026Closed
174
$5.0$251M
21Claude Opus 4.7replaced16 Apr 2026Closed
169
$5.0$251M
Claude Mythos Previewreplaced7 Apr 2026Closed
not scored yet
–––
40Claude Sonnet 4.6replaced17 Feb 2026Closed
160
$3.0$151M
26Claude Opus 4.6replaced5 Feb 2026Closed
167
$5.0$251M
50Claude Opus 4.5replaced24 Nov 2025Closed
153
$5.0$25200K
98Claude Haiku 4.515 Oct 2025Closed
137
$1.0$5.0200K
67Claude Sonnet 4.5replaced29 Sep 2025Closed
146
$3.0$151M
87Claude Opus 4.1replaced5 Aug 2025Closed
140
$15$75200K
96Claude Opus 4replaced22 May 2025Closed
137
–––
104Claude Sonnet 4replaced22 May 2025Closed
135
$3.0$15200K
107Claude 3.7 Sonnetreplaced24 Feb 2025Closed
134
–––
169Claude 3.5 Haikureplaced4 Nov 2024Closed
107
–––
143Claude 3.5 Sonnetreplaced22 Oct 2024Closed
118
–––
155Claude 3.5 Sonnet (Jun 2024)replaced20 Jun 2024Closed
111
–––
197Claude 3 Haikureplaced13 Mar 2024Closed
92
–––
175Claude 3 Opusreplaced4 Mar 2024Closed
105
–––
193Claude 3 Sonnetreplaced4 Mar 2024Closed
95
–––
196Claude 2.121 Nov 2023Closed
93
–––
209Claude Instant9 Aug 2023Closed
88
–––
Claude Instant 1.29 Aug 2023Closed
not scored yet
–––
199Claude 2replaced11 Jul 2023Closed
91
–––
Claudereplaced14 Mar 2023Closed
not scored yet
–––

Index score is fitted from independent evaluations and scaled so GPT-4 = 100; a striped bar is an estimate for a model not yet independently tested. Prices are list prices per million tokens.

Release history24 announcements

The Race →
DateReleaseKindSource
28 Sep 2026Claude Sonnet 5.5Flagshipanthropic.com ↗
22 Sep 2026Claude Opus 5.5Flagshipanthropic.com ↗
1 Sep 2026Claude Fable 5.1 + Mythos 5.1Flagshipanthropic.com ↗
24 Jul 2026Claude Opus 5Flagshipanthropic.com ↗
30 Jun 2026Claude Sonnet 5Flagshipanthropic.com ↗
9 Jun 2026Claude Fable 5 + Mythos 5 (restricted)Flagshipanthropic.com ↗
28 May 2026Claude Opus 4.8Flagshipanthropic.com ↗
16 Apr 2026Claude Opus 4.7Flagshipanthropic.com ↗
7 Apr 2026Claude Mythos Preview (restricted; Project Glasswing)Flagshipanthropic.com ↗
17 Feb 2026Claude Sonnet 4.6Flagshipanthropic.com ↗
5 Feb 2026Claude Opus 4.6Flagshipanthropic.com ↗
24 Nov 2025Claude Opus 4.5Flagshipanthropic.com ↗
15 Oct 2025Claude Haiku 4.5Small / fastanthropic.com ↗
29 Sep 2025Claude Sonnet 4.5Flagshipanthropic.com ↗
5 Aug 2025Claude Opus 4.1Flagshipanthropic.com ↗
22 May 2025Claude Opus 4 + Sonnet 4Flagshipanthropic.com ↗
24 Feb 2025Claude 3.7 SonnetReasoninganthropic.com ↗
22 Oct 2024Claude 3.5 Sonnet (new) + 3.5 Haiku (avail. 11-04)Flagshipanthropic.com ↗
20 Jun 2024Claude 3.5 SonnetFlagshipanthropic.com ↗
4 Mar 2024Claude 3 (Opus/Sonnet; Haiku 03-13)Flagshipanthropic.com ↗
21 Nov 2023Claude 2.1Flagshipanthropic.com ↗
9 Aug 2023Claude Instant 1.2Small / fastanthropic.com ↗
11 Jul 2023Claude 2Flagshipanthropic.com ↗
14 Mar 2023Claude (1)Flagshipanthropic.com ↗

Dates come from each lab's own announcement, linked where one exists.