Claude Sonnet 5.5 (EU)

Claude Sonnet 5.5 scored 56 points on the Artificial Analysis Intelligence Index, landing at No. 2 just behind Anthropic's flagship Opus 5.5 at 58 points, and ahead of OpenAI's GPT-6 Astra at 53 and GPT-6 Sol at 48. The piece highlights a substantial 18-point jump from predecessor Sonnet 5's score of 38, with Artificial Analysis running every model through the same coding, agent, and benchmark suite. The TrendingTopics coverage details strong agentic performance: 64% on Terminal-Bench 4.0 ahead of both Opus 5.5 and GPT-6 Astra at 60%, and 53% on Terminal-Bench-Science behind only those two. Sonnet 5.5 essentially matches Opus 5.5 on knowledge work benchmarks (GDPval-AA: 1844 vs 1846), though it hallucinates at a lower rate of 47% versus Opus's 59%. No Requesty or EU hosting details are addressed.

Anthropic released Claude Sonnet 5.5 on September 28, 2026, as the second model in the Claude 5.5 family, priced at $2 per million input tokens and $10 per million output tokens, unchanged from predecessor Sonnet 5. The Reuters report notes the model needs fewer tokens to complete the same work, and is positioned as a faster, lower-cost complement to Claude Opus 5.5 for everyday enterprise tasks like coding, document creation, and spreadsheet work. The coverage mentions that Haiku 5.5, designed for fast, high-volume work, is due soon, and that enterprise customers account for about 80% of Anthropic's business, including clients such as Salesforce, Databricks, Goldman Sachs, and Novo Nordisk. The report frames the release within Anthropic's broader product lineup expansion ahead of a planned IPO. No Requesty or EU-specific routing information is included.

Anthropic debuted Claude Sonnet 5.5, positioning the model as running approximately 30% faster than the previous-generation Anthropic AI model. The SiliconANGLE trade-press coverage, dated September 28, 2026, frames the release as a notable speed-focused update within Anthropic's Claude lineup. The page excerpt confirms the launch event and headline performance figure for Sonnet 5.5 specifically. The article serves as independent corroboration of the Anthropic Sonnet 5.5 release alongside other contemporaneous coverage. While the scraped excerpt is truncated by navigation and advertising elements, the title and publication date align directly with the model's launch. The piece does not address the Requesty EU hosting variant, keeping focus on the Anthropic model itself.

Anthropic released Claude Sonnet 5.5, the second model in the Claude 5.5 series, as a surprise late-night launch with over 30% speed improvement and nearly 30% cost reduction compared to Claude Sonnet 5. The model scored 56 on the Artificial Analysis AI Analysis Index, second only to Opus 5.5's 58, and is reportedly the first Sonnet model to win Pokémon Red through screenshots alone, demonstrating strong agentic capabilities for daily development tasks. Claude Sonnet 5.5 is priced at $2 per million input tokens, $10 per million output tokens, and $0.20 per million for cache reads, matching the previous generation's list price, though per-task cost is approximately $7.60 due to higher token output, about 50% above Sonnet 5. The model is available across AWS, Google Cloud, and Microsoft Azure, accessible via the identifier claude-sonnet-5-5 on the Claude platform, with an official Rubik's Cube restoration demo completing in 10 seconds at $0.11.

Anthropic launched Claude Sonnet 5.5 as the second product in the Claude 5.5 series, boosting output speed by over 30% and reducing per-task costs by up to 30% through lower token consumption while maintaining base pricing of $2 per million input tokens and $10 per million output tokens. The TradingKey analysis positions it for routine programming, debugging, document creation, and spreadsheet work as a low-cost complement to Opus 5.5. Benchmark figures cited from Anthropic include Terminal-Bench 4.0 at 70.6% versus 10.3% for Sonnet 5, and GDPval-AA at 1844 Elo points, close to Opus 5.5's 1846 and well above Sonnet 5's 1449. The piece frames this as a market shift from nominal token pricing toward task-level efficiency and throughput. No Requesty or EU-specific details appear.

Techzine covers Anthropic's release of Claude Sonnet 5.5 as a more compact version of Opus 5.5, focused on efficiency, short texts, and speed advantages while maintaining strong accuracy. The piece reports benchmark gains over predecessor Sonnet 5, including 70.6% in Terminal-Bench 4.0 versus 10.3% for Sonnet 5, and 61.6% in chart-reading tests (Chartography) where Sonnet 5 scored only 15.6%. The coverage positions Sonnet 5.5 at "Max effort" as approaching the capabilities of Opus 5.5, framing the Sonnet-to-Opus transition as a continuous spectrum of speed, cost, and quality trade-offs. A third Haiku model in the 5.5 generation is also noted as expected. The article does not address the Requesty EU routing configuration.