Claude Sonnet 5

Caylent published a technical launch analysis of Anthropic's Claude Sonnet 5, which Anthropic announced on June 30, 2026 and described as the most agentic Sonnet model yet. The analysis documents concrete model-level changes versus Sonnet 4.6: a 1M-token default context window, a 128K maximum output token limit, adapti The same analysis positions Sonnet 5 as a meaningful upgrade over Sonnet 4.6 for coding, tool use, and agentic follow-through while closing much of the gap to Opus 4.8 at Sonnet-tier pricing, and frames it as Anthropic's mid-tier default for balanced reasoning and high-volume workloads. Caylent's practical recommendati

Claude Sonnet 5 is Anthropic's mid-tier model released on June 30, 2026 with the API model ID claude-sonnet-5, according to Morph's technical write-up. The model ships with a 1M-token context window, a 128K maximum output on the Messages API, adaptive thinking enabled by default, and an effort setting that defaults to The page documents pricing at $2 per million input tokens and $10 per million output tokens, noting that Anthropic made these introductory rates permanent and dropped the previously announced $3/$15 standard tier that was originally slated to take effect after launch. Sonnet 4.6 is listed as the legacy comparison at $3

Anthropic released Claude Sonnet 5 on June 30, 2026, as the latest Sonnet model built for coding, tool use, and long-running agent tasks, with a 1 million-token context window and adaptive thinking enabled by default. The launch announcement calls it the most agentic Sonnet model yet, with the largest gains over Sonnet Key specs include: release date June 30, 2026; API model ID claude-sonnet-5; context window 1 million tokens; maximum output 128,000 tokens (synchronous); input text and images; reliable knowledge cutoff January 2026; adaptive thinking on by default; default effort high on the Claude API and Claude Code; effort levels

CometAPI's overview states that Claude Sonnet 5 is Anthropic's next-generation Sonnet-class model, released June 30, 2026, designed for coding agents, tool use, long-context reasoning, document analysis, and professional automation. It lists a 1M-token context window, 128k max output tokens on the synchronous Messages The page walks through Sonnet 5 features including stronger agentic coding, the 1M-token long context, adaptive thinking by default, better tool use and automation, and improved safety for agentic contexts, with use cases spanning coding agents, long-context document reasoning, business workflow automation, research an

Labellerr's comparison states that Anthropic released Claude Sonnet 5 on June 30, 2026 as the most agentic Sonnet model yet, framing it as a model that can plan, use tools such as browsers and terminals, and run autonomously at a level previously associated with larger, more expensive models. It contrasts Sonnet 4.6, l The article includes a head-to-head prompt in which Sonnet 5 builds an illustrated scene with volumetric clouds, shading, and styled UI elements while Sonnet 4.6 produces a flat, literal rendering of the same request, illustrating Sonnet 5's greater creative and instruction-following depth. The supplied excerpt contain

The benchmark breakdown, sourced from Anthropic's Claude Sonnet 5 announcement and the Sonnet 5 System Card, shows Sonnet 5 beating Sonnet 4.6 on every disclosed benchmark with non-marginal gains (Terminal-Bench jumps more than 13 points, knowledge work jumps 223 Elo points). Sonnet 5 trails Opus 4.8 on raw capability The piece explains what each benchmark actually measures and why the result matters, emphasizing that benchmark tables are easy to publish and hard to interpret without context. It frames the impact on workloads in terms of where Sonnet 5 meaningfully changes the cost-performance profile for Sonnet 4.6 users, while not

Anthropic released Claude Sonnet 5 on June 30, 2026, framing it as the most agentic Sonnet model yet and a major upgrade over Sonnet 4.6, with closer-to-Opus coding, tool use, browser work, and professional-task performance. The API model name is claude-sonnet-5, and the model is available in Claude, Claude Code, and t The developer of record is Anthropic, and the model belongs to the Claude Sonnet family. Sonnet 5 is positioned for multi-step agentic work where the model plans, uses tools, checks outputs, and completes tasks, while Claude Opus 4.8 remains the higher-accuracy reference. API aliases, availability, and pricing can chan

Anthropic launched Claude Sonnet 5 on June 30, 2026, positioning it as the most agentic Sonnet model yet, capable of planning, using tools like browsers and terminals, and running autonomously at a level previously requiring larger, more expensive models. The TechCrunch report notes the launch framing mirrors recent ag At launch, Claude Sonnet 5 is priced at $2 per million input tokens and $10 per million output tokens through August 31, 2026, after which pricing rises to $3 per million input tokens and $15 per million output tokens, making it cheaper than both Opus 4.8 and competing models like OpenAI's GPT-5.5 and Google's Gemini 3

Vellum's benchmark walkthrough of Claude Sonnet 5 details per-evaluation numbers drawn from Anthropic's Sonnet 5 System Card. On SWE-Bench Pro, Sonnet 5 scores 63.2% pass rate versus Sonnet 4.6 at 58.1% and Opus 4.8 at 69.2%, while Cursor's CursorBench shows Sonnet 5 at 57% versus Sonnet 4.6's 49% — the largest jump Cu On Terminal-Bench 2.1 (Terminus-2 harness), Sonnet 5 reaches 80.4% mean reward, moving past Opus 4.8's 74.6% and well ahead of Sonnet 4.6's 67.0% — the first benchmark in the suite where the mid-tier model beats the flagship. Vellum notes that on at least one of Anthropic's headline knowledge-work benchmarks Sonnet 5 a

The LLM Stats composite score places Claude Sonnet 5 at rank 23 overall, with capability-tier rankings including Top 10% in 3D (7 of 94) and Games (8 of 97), Top 10% Vision (16 of 208), and Top 10% Coding (19 of 267). In the cost-efficiency comparison, Sonnet 5's blended price of $2.38 per million tokens corresponds to Benchmark entries include a USAMO 2026 score of 33.39/42 (rank 2), with other tracked datasets covering reasoning, math, chat, tool calling, healthcare, and legal domains. The Quality Tracker shows Sonnet 5 at -0.15σ stable across 118 votes over seven days. Independent quantitative tracking provides cross-reference dat

Claude Sonnet 5 launched on June 30, 2026, as Anthropic's mid-tier Claude model positioned between Haiku 4.5 and the higher Opus and Fable tiers, and Anthropic describes it as "the most agentic Sonnet model yet." The model can build multi-step plans, select required tools such as a browser, terminal, or file editor, ex The model introduces effort levels and agentic behavior changes that distinguish it from prior Sonnet releases, alongside safety and cybersecurity behavior updates noted in the launch. Independent developer testing noted in the review corroborated Anthropic's framing of multi-step autonomous task completion. Pricing, b