Anthropic launches Claude Opus 4.6, OpenAI rolls out GPT-5.3-Codex
Anthropic and OpenAI rolled out dueling models as both large language model providers go after a broader spectrum of professional work.
The duel between Anthropic and OpenAI lands as Wall Street increasingly questions the future of enterprise software. OpenAI already made its move to be an AI agent orchestrator with OpenAI Frontier.
Also note that Google will be updating Gemini in months ahead.
The broad theme for both Anthropic and OpenAI is that they are aiming LLMs at more work tasks and organizing teams of AI agents.
Anthropic Opus 4.6
In a blog post, Anthropic said Claude Opus 4.6 improves on its predecessor's coding skills, but the real win is broader work tasks.
Anthropic said Opus 4.6 can excels at running financial analyses, doing research, and using and creating documents, spreadsheets and presentations. In Cowork, Claude can multitask with Opus 4.6.
Here's a look at the benchmarks.
Anthropic added that it has upgraded Claude in Excel and releasing Claude in PowerPoint in research preview.
GPT-5.3-Codex
As Anthropic was comparing Opus 4.6 to GPT-5.2, Open AI launched GPT-5.3-Codex.
According to OpenAI, GPT-5.3-Codex is its most capable agentic coding model with 25% more speed and ability to handle longer tasks without losing context.
OpenAI said:
"GPT‑5.3‑Codex is our first model that was instrumental in creating itself. The Codex team used early versions to debug its own training, manage its own deployment, and diagnose test results and evaluations—our team was blown away by how much Codex was able to accelerate its own development.
With GPT‑5.3-Codex, Codex goes from an agent that can write and review code to an agent that can do nearly anything developers and professionals can do on a computer."
The expansion of GPT-5.3-Codex takes it beyond ode to more of the software lifecycle. Now slide decks and spreadsheets are also in the mix.
About Larry Dignan: Dignan was most recently Celonis Media’s Editor-in-Chief, where he sat at the intersection of media and marketing. He is the former Editor-in-Chief of ZDNet and has covered the technology industry and transformation trends for more than two decades, publishing articles in CNET, Knowledge@Wharton, Wall Street Week, Interactive Week, The New York Times, and Financial Planning. He is also an Adjunct Professor at Temple University and a member of the Advisory Board for The Fox Business School's Institute of Business and Information Technology. Constellation Insights does the following: Cover the buy side and sell side of enterprise tech with news, analysis, profiles, interviews, and event coverage of vendors, as well as Constellation Research's community and…...
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