Claude Opus 4.8

CloudZero's June 2, 2026 guide covers Claude Opus 4.8 pricing and benchmarks, confirming the May 28, 2026 launch at $5 input / $25 output per million tokens — identical to Opus 4.7. The piece lists four practical changes introduced in 4.8: Dynamic Workflows for parallel agentic coding and Effort Control for managing re The article sets up head-to-head comparisons between Opus 4.8 and Sonnet 4.6 (production balance vs. premium intelligence) and Opus 4.8 and GPT-5.5, with Opus 4.8 priced the same as its predecessor and targeting high-end reasoning and long-horizon agentic coding. It also walks through how to access Opus 4.8 and how Clo

The Agent Report's June 2026 coverage records the May 28, 2026 release of Claude Opus 4.8, pricing held at $5/M input and $25/M output tokens on par with Opus 4.7, and availability through claude.ai, Claude Code, the Claude API (claude-opus-4-8), and Cowork. It highlights Dynamic Workflows in Claude Code, a research-preview feature that lets Opus 4.8 plan tasks and spawn hundreds of parallel subagents in a single session. Coverage cites a 3x cheaper fast mode and benchmarks including SWE-bench Verified 88.6% (+1.0 pp), SWE-bench Pro 69.2% (+4.9 pp), Terminal-Bench 2.1 74.6% (+8.5 pp), Humanity's Last Exam 49.8%, and OSWorld-Verified 83.4% relative to Opus 4.7. Practitioner quotes from a Staff Engineer and from Cognition CEO Scott Wu describe improved judgment and fixes to comment-verbosity and tool-calling issues seen on Opus 4.7.

An allthings.how write-up dated May 31, 2026 reports Claude Opus 4.8 released May 28, 2026, about 41 days after Opus 4.7, with the same price and the same 1 million token context window as its predecessor. It cites an Artificial Analysis Intelligence Index score of 61.4 — the new #1 spot — beating Opus 4.7 by 4.1 point On GDPval-AA, Opus 4.8 is reported at 1,890 Elo at launch — 137 points above Opus 4.7 and 121 ahead of GPT-5.5 xhigh — with an implied roughly 67% win rate against GPT-5.5 on the GDPval task set, achieved in about 15% fewer turns and 35% fewer output tokens than Opus 4.7, though still around 30% more turns than GPT-5.5

R&D World compares Claude Opus 4.8 to Claude Mythos Preview and GPT-5.5 using Anthropic system-card data and Artificial Analysis's independent Intelligence Index, where Opus 4.8 narrowly tops the index at 61.4 versus 60.2 for GPT-5.5 (xhigh). On Anthropic's internal AECI index, Opus 4.8 lands at 155.5, between Opus 4.7 On harder reasoning evaluations, the Mythos and Opus 4.8 gap narrows substantially: GPQA Diamond is roughly a frontier tie at about 94 (94.5 vs 93.6), and the two models sit within a point on USAMO. Across the broader benchmark table, Opus 4.8 posts 49.8 on HLE without tools, 57.9 with tools, 84.3 on BrowseComp single-

Anthropic shipped Claude Opus 4.8 on May 28, 2026, 41 days after the previous Opus drop — the fastest minor-version cadence Anthropic has run — with a 244-page system card and identical $5/$25 per million token pricing to Opus 4.7. The release is available across claude.ai, the Claude API, Amazon Bedrock, Google Vertex The author highlights a stat buried in Anthropic's release post: Opus 4.8 is roughly 4x less likely than Opus 4.7 to let a code flaw pass without flagging it, framed as the most important alignment shift of 2026 for developers. Anthropic itself describes the model as "a modest but tangible improvement" on its predecess

Anthropic shipped Claude Opus 4.8 on May 28, 2026, available immediately on the Claude API, Amazon Bedrock, Google Cloud's Vertex AI, and GitHub Copilot. The API model ID is claude-opus-4-8, and Anthropic's own announcement characterizes the release as "a modest but tangible improvement on its predecessor" — notably re Alongside the model, Anthropic layered new features: Dynamic Workflows in Claude Code (research preview, available on Enterprise/Team/Max plans), effort control surfaces in claude.ai and Cowork, and a Messages API change that lifts the system-entry-inside-messages-array feature out of beta, letting mid-task system prom

An o-mega.ai guide published May 29, 2026 reports that Anthropic released Claude Opus 4.8 on May 28, 2026, roughly 41 days after Opus 4.7, and characterizes the cadence as incremental, targeted improvements rather than generational leaps. It cites specific numbers: 88.6% on SWE-bench Verified, USAMO 2026 math reasoning The same guide frames Opus 4.8 as a benchmarked step forward in capability, efficiency, and cost, and explicitly contrasts it head-to-head with GPT-5.5, which had been released about five weeks earlier. It also notes that Opus 4.8 has since moved into Anthropic's legacy tier — still served at the same price but no long

Appwrite's third-party breakdown of Anthropic's May 28, 2026 launch confirms Claude Opus 4.8 as Anthropic's most capable generally available model, accessible via the Claude API under model id claude-opus-4-8 with a 1M token context window on Claude API, Amazon Bedrock, and Vertex AI (200k on Microsoft Foundry), at unc The Appwrite summary highlights four new capabilities shipping with the model that matter to teams running long agentic workloads: fast mode, mid-conversation system messages (now out of beta), effort control, and dynamic workflows in Claude Code, alongside an explicit honesty-focused improvement making the model flag

Anthropic released Claude Opus 4.8 on May 28, 2026, framing it as "a modest but tangible improvement" over Opus 4.7 at unchanged pricing of $5 per million input tokens and $25 per million output tokens. The Vellum walkthrough highlights Opus 4.8 reaching 69.2% on SWE-Bench Pro (vs. 64.3% for Opus 4.7, 58.6% for GPT-5.5 On Terminal-Bench 2.1 the article stresses harness sensitivity, noting GPT-5.5's headline 83.4% used the Codex CLI while apples-to-apples on Terminus-2 places Opus 4.8 at 74.6% — closer to GPT-5.5's 78.2% and well above Gemini 3.1 Pro's 70.3% and Opus 4.7's 66.1%. Opus 4.8 also lands at 88.6% on SWE-Bench Verified, mod