Claude Sonnet 4.5
Released 2025-09-29
The Model Release Experiment
Claude
Claude Haiku 4.5
Released 2025-10-15
Earlier attempts (1)
Claude Opus 4.5
Released 2025-11-24
Claude Opus 4.6
Released 2026-02-05
Claude Sonnet 4.6
Released 2026-02-17
Claude Opus 4.7
Released 2026-04-16
Claude Opus 4.8
Released 2026-05-28
Claude Sonnet 5
Released 2026-06-30
- Medium thinking · default verbosityReceipt passed
- Low thinking · default verbosityReceipt failed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt passed
- Max thinking · default verbosityReceipt passed
Earlier attempts (1)
Claude Opus 5
Released 2026-07-24
- Medium thinking · default verbosityReceipt passed
- Low thinking · default verbosityReceipt passed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt passed
- Max thinking · default verbosityReceipt passed
Earlier attempts (1)
Claude Fable 5.1
Released 2026-09
- Medium thinking · default verbosityReceipt passed
- Low thinking · default verbosityReceipt passed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt passed
- Max thinking · default verbosityReceipt passed
Earlier attempts (1)
Claude Opus 5.5
Released 2026-09-22
- Medium thinking · default verbosityReceipt passed
- Low thinking · default verbosityReceipt passed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt passed
- Max thinking · default verbosityReceipt passed
Earlier attempts (1)
Claude Sonnet 5.5
Released 2026-09-28
Claude Fable 5
First seen 2026-10-02; release date unavailable
Codex
GPT-5.3-Codex-Spark
Retired 2026-09-14
Unavailable for new runsGPT-5.5
Released 2026-04-23
- Medium thinking · default verbosityReceipt passed
- Low thinking · default verbosityReceipt failed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt passed
- Medium thinking · low verbosityReceipt passed
- Medium thinking · medium verbosityReceipt passed
- Medium thinking · high verbosityReceipt failed
GPT-5.6-Luna
Released 2026-07-09
- Medium thinking · default verbosityReceipt failed
- Low thinking · default verbosityReceipt failed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt passed
- Max thinking · default verbosityReceipt failed
- Medium thinking · low verbosityReceipt failed
- Medium thinking · medium verbosityReceipt failed
- Medium thinking · high verbosityReceipt failed
GPT-5.6-Sol
Released 2026-07-09
- Medium thinking · default verbosityReceipt failed
- Low thinking · default verbosityReceipt passed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt passed
- Max thinking · default verbosityReceipt passed
- Ultra thinking · default verbosityReceipt passed
- Medium thinking · low verbosityReceipt failed
- Medium thinking · medium verbosityReceipt failed
- Medium thinking · high verbosityReceipt failed
GPT-5.6-Terra
Released 2026-07-09
- Medium thinking · default verbosityReceipt passed
- Low thinking · default verbosityReceipt failed
- High thinking · default verbosityReceipt failed
- Xhigh thinking · default verbosityReceipt passed
- Max thinking · default verbosityReceipt passed
- Ultra thinking · default verbosityReceipt passed
- Medium thinking · low verbosityReceipt failed
- Medium thinking · medium verbosityReceipt failed
- Medium thinking · high verbosityReceipt passed
GPT-6-Astra
Released 2026-09-03
- Medium thinking · default verbosityReceipt passed
- Low thinking · default verbosityReceipt passed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt passed
- Max thinking · default verbosityReceipt passed
- Ultra thinking · default verbosityReceipt passed
- Medium thinking · low verbosityReceipt passed
- Medium thinking · medium verbosityReceipt passed
- Medium thinking · high verbosityReceipt passed
GPT-6-Luna
Released 2026-09-22
- Medium thinking · default verbosityReceipt failed
- Low thinking · default verbosityReceipt failed
- High thinking · default verbosityReceipt failed
- Xhigh thinking · default verbosityReceipt failed
- Max thinking · default verbosityReceipt passed
- Medium thinking · low verbosityReceipt failed
- Medium thinking · medium verbosityReceipt failed
- Medium thinking · high verbosityReceipt failed
GPT-6-Sol
Released 2026-09-22
- Medium thinking · default verbosityReceipt passed
- Low thinking · default verbosityReceipt failed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt failed
- Max thinking · default verbosityReceipt passed
- Ultra thinking · default verbosityReceipt failed
- Medium thinking · low verbosityReceipt passed
- Medium thinking · medium verbosityReceipt failed
- Medium thinking · high verbosityReceipt passed
GPT-6.1-Sol
Released 2026-09-29
- Medium thinking · default verbosityReceipt passed
- Low thinking · default verbosityReceipt failed
- High thinking · default verbosityReceipt passed
- Xhigh thinking · default verbosityReceipt passed
- Max thinking · default verbosityReceipt passed
- Ultra thinking · default verbosityReceipt passed
- Medium thinking · low verbosityReceipt passed
- Medium thinking · medium verbosityReceipt passed
- Medium thinking · high verbosityReceipt passed