Unverified50% confidenceBenchmarkExact time
On the 7 prompts ending with "JSON only", Haiku 4.5 wrapped its answer in a Markdown code block every time, 154 out of 154; Haiku 5.5 returned bare JSON about 60% of the time and still had code fences the rest of the time.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/18/2026
First Seen
Valid until: 1/16/2027
Sources
Related Entities
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