They reduced the price of Opus from $15/M input and $75/M output (at the time of Opus 4.1) to $5/$25 starting with version 4.5 in November… but apart from that, nothing. Haïku costs more than GPT-5.4 Mini and is more expensive than many Geminis.
@simonw
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2026 budget spent early not notable due to unknown Claude Code in 2025
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I don't think "we spent our 2026 budget in 4 months" is particularly notable given that the budget would have been set in 2025 when nobody knew how good Claude Code et al were about to get as-of January
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Updated post on product market fit with AI failure stories note
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Just updated my post here to include the "harder to justify" note https://
simonwillison.net/2026/May/27/pr
oduct-market-fit/#the-ai-failure-stories-around-this-are-pretty-thin
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SVG: Real code versus model-generated vector illustration
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It's an SVG if there's a text version of it that starts with <svg – any good image generation model will produce a beautiful vector-style flat illustration if you ask it for an SVG, but it won't write actual code
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Skepticism toward rumors about Uber’s AI budget
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I am skeptical of this whole story that Uber spent its AI budget and is disappointed with the results – I dug into the question and it seems that it rests on very shaky ground.
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Notes on Claude Opus 4.8 and pelicans on bicycles for five reflections
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Notes on Claude Opus 4.8, plus pelicans riding bicycles for each of the five different reflection efforts
https://
simonwillison.net/2026/May/28/cl
aude-opus-4-8/
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The irresistible urge to announce AI labs train on my benchmark
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The thing I most need a name for right now is that irresistible urge to announce to myself that AI labs are probably training on my benchmark as soon as I share an image of a pelican riding a bicycle anywhere on the internet.
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Half of reactions would be LLM-related psychosis
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I think that half of them vaguely correspond to a psychosis linked to LLMs!
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API pricing doubled on latest models amid enterprise deals
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2x API pricing on the latest models coinciding with enterprise deals locking big companies into those prices
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April 2026: OpenAI and Anthropic achieve product-market fit
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Given the recent burst of activity around enterprise pricing and contracts, I think April 2026 was the month when both OpenAI and Anthropic found product-market fit