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Article URL: https://code.claude.com/docs/en/data-usage Comments URL: https://news.ycombinator.com/item?id=49056689 Points: 7 # Comments: 0

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Opus 5 runs at 5 and 25 per million tokens against Fable 5 at 10 and 50, so the top tier now costs double for a much smaller gap Thinking is on by default on Opus 5, which silently changes what a tight max_tokens setting does to your output Disabling thinking now returns an error above high effort, so any xhigh or max route that turns it off needs an audit before you migrate Prompt caching starts at 512 tokens on Opus 5, half the Opus 4.8 floor, so short reusable prompts cache with no code change In June I worked through whether Claude Fable 5 was worth double the price of Opus 4.8 and concluded that it usually was, for hard work. Claude Opus 5 landed on July 24 at Opus 4.8's exact price and closed most of that gap. So the answer changed, and a few of the changes will throw errors in code that worked last week. The Price Gap Held, the Capability Gap Closed Opus 5 costs 5 and 25 per million tokens, input and output. That is identical to Opus 4.8 and exactly half of Fable 5 at 10 and 50. Anthropic did not raise the sticker price on the tier it improved, which is the single most consequential fact in this release. What that buys, on the numbers: 79.2 percent on SWE-bench Pro against Fable 5's 80.3, and a CursorBench 3.2 result Anthropic describes as landing within 0.5 percent of Fable 5's peak at max effort, at half the cost per task. On OSWorld 2.0 it goes past Fable 5's best computer-use result at just over a third of the cost. A 1.1 point deficit on the headline coding row, for half the money. Last month the equivalent comparison had an 11 point spread. That is what actually changed, and it flips the default: Fable 5 used to be the reasonable choice for anything hard, and now it has to argue for itself on each task. There is a quieter cost lever too. The minimum cacheable prompt on Opus 5 is 512 tokens, down from 1024 on Opus 4.8. Prompts I had written off as too short to cache now create entries with no code change at all. If you run a lot of small repeated calls,

Three labs shipped flagship models in fifteen days: GPT-5.6 Sol on July 9, Kimi K3 on July 16, Claude Opus 5 on July 24 Opus 5 leads SWE-bench Pro 79.2 to 64.6 over Sol, and ARC-AGI-3 30.2 to 7.8 Sol holds Terminal-Bench 2.1 at 91.9 percent in its top mode and still takes DeepSWE 1.1 and HealthBench Professional Kimi K3 is a 2.8 trillion parameter open-weight model at 3 and 15 per million tokens, roughly 40 percent under Opus 5 on input Fifteen days. That is the gap between OpenAI making GPT-5.6 Sol generally available and Anthropic shipping Claude Opus 5, with Moonshot dropping a 2.8 trillion parameter open-weight model in the middle of it. I wrote a frontier check like this in June and most of it is already out of date, so here is where the three current flagships actually stand. Three Flagships in Fifteen Days Model Lab GA Context Per million (in / out) GPT-5.6 Sol OpenAI 2026-07-09 1.05M 5 / 30 Kimi K3 Moonshot AI 2026-07-16 1M 3 / 15 Claude Opus 5 Anthropic 2026-07-24 1M 5 / 25 The specs have converged to the point where they barely differentiate anything. All three sit at or just above a million tokens of context. All three cap output around 128k. The input prices are within a factor of two of each other. Two years ago a context window was a headline; now it is table stakes, and the interesting differences have moved entirely into behavior under load. Two timing details that get flattened in the coverage. GPT-5.6 Sol was previewed on June 26 and only became generally available on July 9, so some of the earliest benchmark tables were run against a preview build. And Sol is the top of a three-model family alongside Terra and Luna, spanning roughly 1 to 30 per million tokens depending on tier. Comparing Opus 5 to "GPT-5.6" without saying which one is close to meaningless, which is a large share of the comparisons currently circulating. One structural note on Kimi K3, because the parameter count gets quoted carelessly. It is a mixture-of-experts model with 896 exp

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AI-Driven Development: How Machine Learning is Reshaping Software Workflows in 2026 The software development landscape of 2026 looks almost unrecognizable compared to just a few years ago. Artificial intelligence has moved from being a novel assistant to a core pillar of the development workflow. Today, AI doesn't just autocomplete a line of code; it helps architect entire systems, automatically detects and fixes bugs before they reach production, and continuously learns from the organization's codebase to accelerate every phase of delivery. This article explores the key transformations and practical examples of how AI is reshaping software development in 2026. AI-Powered Code Generation and Completion By 2026, AI-powered code assistants have evolved far beyond simple autocomplete. Modern systems understand natural language requirements, project architecture, and even business logic. Developers can describe complex features in plain English, and the AI generates multi-file implementations, including dependency management, configuration, and tests. Example: Generating a REST API with AI A developer might request: "Create a FastAPI endpoint for user registration with email verification, rate limiting, and an asynchronous database call." The AI would produce: from fastapi import APIRouter , HTTPException , Depends from sqlalchemy.ext.asyncio import AsyncSession from app.database import get_async_session from app.models import User from app.schemas import UserCreate , UserResponse from app.services import create_user , send_verification_email from app.rate_limiter import rate_limit router = APIRouter ( prefix = " /auth " , tags = [ " auth " ]) @router.post ( " /register " , response_model = UserResponse ) @rate_limit ( max_requests = 5 , window_seconds = 60 ) async def register ( user_data : UserCreate , db : AsyncSession = Depends ( get_async_session )): existing_user = await User . find_by_email ( db , user_data . email ) if existing_user : raise HTTPException ( statu