Microsoft Azure vs Together AI

Zendesk Names Rachita Sundar as CFO

Zendesk announced the appointment of Rachita Sundar as Chief Financial Officer, effective September 28, 2026. Sundar, who brings over 20 years of experience in finance and operations at technology companies including Microsoft Azure, HubSpot, and Qualtrics, succeeds Julie Swinney, who transitions to Chief Administrative Officer and executive sponsor of Zendesk's Employee Service business. At Qualtrics, Sundar helped finance and close the $6.75 billion acquisition of Press Ganey Forsta. CEO Tom Eggemeier highlighted her financial rigor and operational expertise as Zendesk scales toward a multi-billion-dollar AI business.

• Rachita Sundar appointed CFO of Zendesk, effective September 28, 2026.
• Sundar has over 20 years of experience at Microsoft Azure, HubSpot, and Qualtrics.
• At Qualtrics, Sundar helped finance and close the $6.75 billion acquisition of Press Ganey Forsta.

Anthropic Launches Claude Opus 5.5 Despite Slowdown Call

Anthropic released Claude Opus 5.5, its flagship AI model and the first in the 5.5 family, on September 22, 2026. It achieves the highest-ever score (58) on the Artificial Analysis Intelligence Index and leads six out of ten benchmarks, including outperforming OpenAI's GPT-6 Astra on Terminal-Bench 4.0. Priced at $4 per million input tokens and $20 per million output tokens (20% lower), it promises a 40% cost reduction for typical workloads, though savings depend on config. It is 30% faster, now defaults in Claude Code and the Claude app, and matches Claude Fable 5.1 on most tasks. Early tests show efficiency gains but also more concurrency issues and security test failures. Anthropic cites external safety evaluations, and OpenAI responded with GPT-6 Sol and Luna, priced ~50% lower and offering up to 90% cache discounts.

• Claude Opus 5.5 scores 58 on the Artificial Analysis Intelligence Index, the highest recorded, and leads six out of ten benchmarks.
• Pricing reduced to $4 per million input tokens, $20 per million output tokens, and cache reads at $0.20 per million tokens, promising a 40% cost reduction per task (though configuration may affect savings).
• Opus 5.5 is 30% faster, supports multi-agent scaling up to 100 parallel agents, and is now default in Claude Code and the Claude app.

Anthropic Launches Claude Fable 5.1 with Top AI Benchmarks

Anthropic launched Claude Fable 5.1 and its sibling Claude Mythos 5.1, showcasing improved performance in coding and knowledge work. Fable 5.1 achieved a record 66 on the Artificial Analysis Intelligence Index at maximum reasoning effort, surpassing previous top models. Anthropic slashed cache read prices by 75% to $0.25 per million tokens, claiming potential savings of up to 45% for agentic workloads, though actual per-task costs may rise due to higher token use. The models are available via the Claude API and major clouds including AWS, Google Cloud, and Microsoft Azure. Enterprise Frontier Safeguards enable customers to retain data in their own cloud with zero data retention, and invisible watermarking ensures compliance with the EU AI Act. Pro subscribers must pay extra for Fable 5.1, with Opus 5 remaining the best bundled option.

• Anthropic released Claude Fable 5.1 and Mythos 5.1, with Fable achieving a record 66 on the Artificial Analysis Intelligence Index.
• Cache read prices were reduced by 75% to $0.25 per million tokens, potentially cutting agentic workload costs by up to 45%.
• The models are available on the Claude API and major clouds (AWS, Google Cloud, Microsoft Azure).

Introducing Together Link: Run open models inside the harness you already use

Together AI announces Together Link, a new product that allows running open models within existing harnesses, alongside new research blog posts on ThunderKittens for NVIDIA Vera Rubin NVL72, ThunderAgent, and ICML 2026 participation.

Open or Closed AI: Founders' Choices at TechCrunch Disrupt 2026

The article previews upcoming discussions at TechCrunch Disrupt 2026 (Oct 13-15, San Francisco) on AI model strategy. It highlights how startups increasingly use multiple models—open and proprietary—for different tasks, weighing cost, performance, and flexibility. Sessions feature leaders from Together AI, Pathway, Oumi, Nvidia, and Ricursive Intelligence. Topics include whether to build, customize, or rent AI models, optimizing AI hardware (chip design), and trade-offs between frontier APIs (like OpenAI, Google) and open-weight models. The article emphasizes that model choice shapes product differentiation, infrastructure needs, and long-term business viability. It's a conference promotion with substantive insights on AI architecture decisions.

• TechCrunch Disrupt 2026 takes place Oct 13-15 at Moscone West, San Francisco.
• The conference features 200+ sessions, 250+ speakers, and 300+ exhibiting startups.
• Sessions cover multi-model strategies, custom model development, and AI-designed hardware.

Together AI Product Team Shares AI-Native Workflow Stack

Together AI's product team, including CPO Charles Zedlewski and PMs Necoline Hubner and Pavneet Ahluwalia, outlined their AI-native product development stack in a podcast. The stack comprises four components: a shared context repository accessible by any AI harness, skills for feature research and PRD writing, an orchestrator for leadership, and agent evals. The team emphasizes collective productivity over individual gains, using multiple models like GLM and Kimi instead of relying solely on Anthropic. They validate products through agent-based tests, checking if AI agents can complete tasks using their documentation and API. The article also highlights Together AI's $8.3 billion valuation from its Series C round.

• Together AI is valued at $8.3 billion.
• Together AI's product team uses a four-component AI-native stack: shared context repo, skills, orchestrator, and agent evals.
• The team uses multiple AI models (e.g., GLM, Kimi) rather than only Anthropic's models.