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Sonnet 5.5

884 points · 613 comments · D2OQZG8l5BI1S06

simonw · 1790621080 · focus · HN ↗
Pelicans. Sonnet 5.5 has the same problem as Opus 5.5: on "max" thinking effort it burned through 128,000 thinking tokens (taking 15 minutes to do that) and ran out before it had produced the final SVG.
<a href="https://tools.simonwillison.net/markdown-svg-renderer?url=https%3A%2F%2Fgist.github.com%2Fsimonw%2F1d85a9be7f3ecce26e7f1569161a0d01" rel="nofollow">https://tools.simonwillison.net/markdown-svg-renderer?url=ht...
Here's how the thinking effort levels compare:
```
  low
  27 input, 1,623 output, thinking_tokens: 0
  1.6284
  Duration: 10138ms (10s)
  
  medium
  27 input, 1,796 output, thinking_tokens: 0
  1.7914 cents
  Duration: 11266ms (11s)

  high
  27 input, 2,334 output, thinking_tokens: 745
  2.3394 cents
  Duration: 17376ms (17s)

  xhigh
  27 input, 5,730 output, thinking_tokens: 2535
  5.7354 cents
  Duration: 41882ms (41s)

  max (failed to return response)
  27 input, 128,000 output, thinking_tokens: 128000
  $1.28
  Duration: 940617ms (15m 40s)
```
Low and medium both used 0 thinking tokens.
1. platinumrad · 1790623033 · focus · HN ↗
  The contrast between Anthropic, who seem to be training their models to output ever-increasing numbers of reasoning tokens, and Fireworks's Ember-1, which was explicitly trained to preserve the quality of a model's responses while cutting down on reasoning, is interesting. Claude Code also uses more many tokens per task per model than any other harness in benchmarks.
  1. usef- · 1790629599 · focus · HN ↗
    Anthropic's "Max" modes seem like a yolo mode: "use 10x the tokens to try to break the hardest possible problems". But their models don't seem less efficient at normal reasoning modes.
    I can't see Ember on AA's index yet, but their post claims "half the reasoning tokens for the same answers" as Kimi K3.
    That would make it about so, I assume?
    Score Tokens Reason Cost Kimi K3 Max 44 48k 32k $2.00 Half reason 44 32k ? 16k ? ? Opus Med 51 26k 12k $1.34 Opus High 54 36k 18k $1.82 Opus Max 58 119k 84k $5.98 Sonnet Med 41 ? ? $0.59 Sonnet High 47 ? ? $1.08 Sonnet Max 56 193k 142k $7.60
    Medium is Anthropic's default.
    Having a less efficient mode isn't necessarily a mistake -- the purpose of configurable effort levels after all is to be able to put more thought into a problem.

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