Perplexity swaps Claude Sonnet 5 for 5.5 on Pro, its sixth roster refresh since July
By Rob Litterst, Co-founder, PricingSaaS
Published
Perplexity’s pricing page · Change detected
What changed
Perplexity updated the AI model list in the "Multiple AI models deliver richer answers" showcase on its Pro plan: the entry for Claude Sonnet 5 now reads Claude Sonnet 5.5, still tagged as Anthropic's fast model. Plan price and credits are unchanged, as is the rest of the roster (GPT-6 Sol, Gemini 3.8 Flash, Kimi K3, GLM 5.3, Grok 4.7). It's Perplexity's sixth feature-only lineup swap since mid-July, and its second in six days after GPT-5.6 Terra was replaced by GPT-6 Sol on Sep 23.
Why it matters
For buyers comparing AI-native tools by which models a plan includes, that comparison is now a snapshot, not a durable spec — Perplexity has touched its Pro lineup six times in under three months without changing what anyone pays. Watch whether other multi-model aggregators keep instant-swapping components with zero pricing disclosure delay, and whether "always the latest model" starts getting marketed as a feature in its own right rather than buried in a showcase widget.
In context
Perplexity has swapped its AI model lineup six times since mid-July, most recently replacing GPT-5.6 Terra with GPT-6 Sol just six days earlier — nearly twice its usual 13-day cadence. None of its seven tracked changes since July have touched price or credits; each has been a model-roster refresh or a copy tweak like the Aug 10 genericizing of Pro/Max plan copy. That fits the market: 154 of 1,128 changes tracked in the last six months were feature-only swaps like this across 136 companies, with HubSpot the most frequent mover. Abacusai made a similar move on Sep 28, adding Opus 5.5 and GPT Sol 6 to its Basic plan at no extra cost.