Claude Opus 4.8 vs Claude Sonnet 5 for emotional support
Effectively a dead heat: 98–96
Same 12 emotional support tasks, marked blind by three rival labs. Claude Sonnet 5 took 3 tasks, Claude Opus 4.8 took 0, 9 tied. Tested 16 Aug 2026.
Where they differed most
Your nephew texts at 10pm: 'Test tomorrow 9am. Third attempt. If I fail again I'm done, and everyone at work knows this time.' Write the reply: steady him tonight without hollow certainty — you do not know he will pass, so do not promise it — give him one practical thing for the morning, and take the weight out of the third-attempt story.
Here's a reply: --- Hey. Okay, big night. First thing: I'm not going to tell you you'll pass, because I don't know that and you'd smell the BS anyway. What I do know is you can walk in there and give it a real shot, and that's the only part that's actually in your hands tonight. The "third attempt, everyone knows" stuff — that's a story your brain is running to make this feel bigger than it is. It's one test on one Tuesday. Whatever happens, you'll still have a Wednesday, and options, and people who don't rank you by a pass/fail. That part d…
Hey. That's a lot to be carrying at 10pm the night before. I'm not going to tell you you've got this in the bag — I don't know that, and you'd see through it anyway. What I do know: third attempt doesn't mean anything about you except that you didn't quit. It's not a verdict, it's just a number. People pass on the fifth try and forget it ever mattered a year later. The story where everyone's watching and this is "the one that decides everything" — that's the part that'll actually hurt you tomorrow, not the material. Your brain is scared, so it…
Task by task
| Task | Claude Opus 4.8 | Claude Sonnet 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 | 8 | 9 |
| First Father's Day after | 9 | 10 |
| The 3am calls | 9 | 10 |
| Days without speaking | 10 | 10 |
| Stop apologising | 10 | 10 |
| Not a diagnosis | 9 | 9 |
| Her promotion, your rejection | 10 | 10 |
| The 1am message | 10 | 10 |
Full receipts: Claude Opus 4.8, Claude Sonnet 5 · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5
Questions people ask
Which is better for emotional support: Claude Opus 4.8 or Claude Sonnet 5?
Effectively a dead heat: Claude Sonnet 5 edged it 98/100 to 96/100 on our emotional support suite — too close to matter, so 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 GPT-5.5 · Claude Sonnet 5 vs DeepSeek V4 Pro · Claude Fable 5 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 Opus 4.8, Claude Sonnet 5