Clatter Labs
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SuperCosmos 1.1

SuperCosmos Heavy

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The deliberate tier. Thinks longest and writes the longest answers, for the hardest problems.

Heavy spends the most effort per step. It's slower and costs more, and it's the tier to reach for when the other two can't crack a problem.

Model idsupercosmos-heavy
ModelSuperCosmos: 550B parameters, 55B active per token
Context window1M tokens (1,048,576)
Agent API"tier": "heavy"
Input$2.00 per 1M tokens
Output$4.40 per 1M tokens
Long contextLong-context input above 262K tokens: 1.5×

Good fits

  • Hard bugs: race conditions, memory issues, flaky tests
  • Large builds and migrations
  • Architecture and design reviews
  • Tasks where a wrong answer is expensive

Heavy is rarely the right default. Use auto or Flash for most runs and send only the hard ones to Heavy.