Hybrid reasoning model that pushes the frontier for coding and AI agents, featuring a 200K context window ... Claude Opus 4.5 is our most intelligent model to date. It sets a new standard across coding, agents, computer use, and enterprise workflows. Opus 4.5 is a meaningful step forward in ...

1 week ago - This general purpose large language model is designed for both complex reasoning and real-world applications at enterprise scale. It supports text and image input, with a 200K token context window and 32K output token capabilities.

Claude Opus 4.1 comes with a 200K token context window. GPT-5 bumps this up to 400K tokens with a maximum output of 128K.

August 26, 2025 - Context Window: Sonnet 4 recently announced beta support for up to 1M tokens, enabling massive-scale processing; Opus 4.1 also offers very large context windows (tens to hundreds of thousands of tokens depending on cloud provider configurations) but ...

August 6, 2025 - Claude Opus 4.1 hits 74.5% on SWE-bench ... bugs. Not earth-shattering, but solid. The context window remains at 200,000 tokens with 32,000 output tokens....

Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. Run Claude Opus 4.1 with API

August 22, 2025 - While Sonnet 4 leads the 1M beta rollout, Opus 4.1 remains optimized for intensive reasoning tasks, sustaining a 200,000-token context window with faster average token generation speeds than previous models.

1 month ago - See how ChatGPT 5 and Claude Opus 4.1 differ in 2025, from context depth to multimodal workflow support and coding accuracy.

Claude Opus 4.1 from Anthropic, supports customizable thinking budget (up to 32k tokens) and 200k context window. To instruct the bot to use more thinking effort, add --thinking_budget and a number ranging from 0 to 31999 to the end of your message.

August 13, 2025 - Released in August 2025 as an upgrade to Opus 4. Here’s a Claude Opus 4.1 vs Claude Opus 4 comparison for the curious ones. More precise coding and better multi-file reasoning. Slight benchmark gains over Opus 4. Context window remains 200K.

September 9, 2025 - The model has the same 200,000 token context window as the previous model, with 32,000 output tokens, while it gains an expanded thinking capability which can now use up to 64,000 tokens for complex reasoning tasks.

OverviewPrompt generatorUse prompt templatesPrompt improverBe clear and directUse examples (multishot prompting)Let Claude think (CoT)Use XML tagsGive Claude a role (system prompts)Prefill Claude's responseChain complex promptsLong context tipsExtended thinking tips ... Reduce hallucinationsIncrease output consistencyMitigate jailbreaksStreaming refusalsReduce prompt leakKeep Claude in character ... Claude is a family of state-of-the-art large language models developed by Anthropic. This guide introduces our models and compares their performance. ... If you're unsure which model to use, we recommend starting with Claude Sonnet 4.5.

Claude Opus 4.1’s 200,000-token context window and 74.5% SWE-bench score really caught my attention. For working with large documents or complex codebases, that kind of memory and reasoning capability is a game changer.

August 12, 2025 - OpenAI followed suit earlier this year with the launch of GPT-4.1, which also supported a 1 million token context window (but then GPT-5 brought that down to 400,000 tokens again).

June 15, 2025 - Main power comes from creating "peon" agents for the expensive claudes to use, they cost less and work faster and the bigger ones micromanage it More replies More replies ... Haiku uses few tokens and is good for very simple tasks, for distill information, for some MCP like context7, for some simple file operations and so on. In short, you don't always need Sonnet and if you have a $20 or $100 plan at which you sometimes use Opus if you have access then limiting the limit is at a "premium".

OverviewPrompt generatorUse prompt templatesPrompt improverBe clear and directUse examples (multishot prompting)Let Claude think (CoT)Use XML tagsGive Claude a role (system prompts)Prefill Claude's responseChain complex promptsLong context tipsExtended thinking tips ... Reduce hallucinationsIncrease output consistencyMitigate jailbreaksStreaming refusalsReduce prompt leakKeep Claude in character ... Claude is a family of state-of-the-art large language models developed by Anthropic. This guide introduces our models and compares their performance. ... If you're unsure which model to use, we recommend starting with Claude Sonnet 4.5.

September 10, 2025 - I can say with complete certainty that you have never had a 1m token context window in Opus 4.1.

Opus 4.1 advances our state-of-the-art coding performance to 74.5% on SWE-bench Verified. It also improves Claude’s in-depth research and data analysis skills, especially around detail tracking and agentic search.