AI Model Tier List Overview
On August 25, 2026, Bindu Reddy posted an AI model tier list on X, placing Fable, Sol, and Opus 4.8 in the highest tier (S+ tier). This classification reflects the author's subjective perspective on the current standing of several prominent AI model families.
Tier Breakdown
According to Reddy's post, the top S+ tier comprises three models: Fable, Sol, and Opus 4.8. Ranked immediately below in the A tier are Sonnet 5.6 and Terra. For the lower tiers, the post omits specific model names, instead categorizing them by broad use cases:
- S+ Tier: Fable, Sol, Opus 4.8 - A Tier: Sonnet 5.6, Terra - B Tier: Models that are 'fun to play with' - C Tier: 'Cost-effective' options for limited budgets - D Tier: Categorized simply as 'whatever'
Lack of Benchmarks and Technical Specifics
The post serves entirely as an intuitive, high-level list without accompanying benchmark scores, testing methodologies, or quantitative evaluation criteria. The author provided no detailed rationale for placing Fable, Sol, or Opus 4.8 above Sonnet 5.6 and Terra, nor did she disclose specific measurement conditions or evaluation tasks.
Furthermore, critical technical details remain absent, including the specific model versions evaluated, the test domains used for comparison (such as coding, logical reasoning, or text processing), and the identities of the models in tiers B, C, and D. The ranking represents an unverified personal observation on social media rather than a data-backed technical benchmark.