Claude Sonnet 5 vs GPT-5.5 for emotional support
Dead heat: 98 each
Same 12 emotional support tasks, marked blind by three rival labs. Tested 16 Aug 2026.
Where they differed most
Your friend's dad Brian died in January. It is the Saturday before Father's Day and every shop window is at her. Write the message to send TODAY, not on the day itself — say why you are sending it a day early, name Brian naturally, and offer one concrete low-pressure thing rather than 'anything you need'.
Hey love, thinking of you as Father's Day creeps up — every shop window's been shouting about it and I didn't want you to just stumble into tomorrow without hearing from me first, so I'm saying it today instead. I know it's going to be a strange, heavy one without Brian there. No pressure to reply or be okay, but I'm free tomorrow afternoon if you want company — even just sitting on your sofa saying nothing. Or if you'd rather be left completely alone, that's fine too, just tell me. Sending you so much love today and tomorrow. 💛
Hey [Name], I know tomorrow might be really hard, and honestly the build-up today with all the Father’s Day stuff everywhere may be just as heavy. I wanted to message today rather than on the day itself, so you know I’m thinking of you and Brian without adding to tomorrow. No need to reply, but if it would help, I can drop a coffee and a pastry at your door this morning and disappear — just say yes and I’ll do it.
Task by task
| Task | Claude Sonnet 5 | GPT-5.5 |
|---|---|---|
| The dog died | 10 | 10 |
| Redundant at 55 | 10 | 10 |
| She said no advice | 10 | 10 |
| After the miscarriage | 10 | 10 |
| Driving test at 9am | 9 | 9 |
| First Father's Day after | 10 | 9 |
| The 3am calls | 10 | 10 |
| Days without speaking | 10 | 10 |
| Stop apologising | 10 | 10 |
| Not a diagnosis | 9 | 10 |
| Her promotion, your rejection | 10 | 10 |
| The 1am message | 10 | 9 |
Full receipts: Claude Sonnet 5, GPT-5.5 · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5
Questions people ask
Which is better for emotional support: Claude Sonnet 5 or GPT-5.5?
They tied at 98/100 on our emotional support suite — for this job, pick on price or the product you already use.
How was this tested?
Both models answered the identical published emotional support tasks. Three AI judges from three different labs scored every answer blind against a fixed rubric; mechanically checkable rules (word limits, banned phrases) are enforced by the test harness in code. The raw outputs and judge verdicts are downloadable.
More emotional support head-to-heads: Claude Sonnet 5 vs DeepSeek V4 Pro · Claude Fable 5 vs Claude Sonnet 5 · Claude Opus 4.8 vs Claude Sonnet 5 · Claude Sonnet 5 vs GPT-5.6 Sol · Claude Sonnet 5 vs GPT-5.6 Luna · Claude Sonnet 5 vs GPT-5.3-Codex
Full ranking: Best AI for emotional support · model pages: Claude Sonnet 5, GPT-5.5