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.

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

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

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).

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....

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’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.

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".

August 6, 2025 - Claude Opus 4.1 is Anthropic’s ... tackle complex problems through sophisticated reasoning chains when needed. With a 200K context window and support for up to 32K output tokens, Claude Opus 4.1 is built to handle extensive, ...

May 22, 2025 - Claude Opus 4 is Anthropic's most powerful model and the world's best coding model, part of the Claude 4 family. It delivers sustained performance on complex, long-running tasks and agent workflows.

Eden AI delivers a unified platform that grants seamless access to both Claude Opus 4 and GPT-4.1 through a single API, eliminating the hassle of managing multiple API keys and simplifying integration workflows.

August 5, 2025 - 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.

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 ...

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.

May 29, 2025 - The main limitation noted is not in its coding skill, but in context length relative to one competitor — Claude 4’s context window is 200K tokens (already enormous, roughly >150,000 words of code) but Google’s Gemini 2.5 Pro offers an ...

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.

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.

June 10, 2025 - Claude 4 Opus: 200K context, 32K max output, $15 per million input tokens, $75 for output · Claude 4 Sonnet: 200K context, 64K max output, $3 per million input tokens, $15 for output · These are the same prices as the previous generation. Usually, we expect prices to drop or context windows to increase with each release—but not this time.

1 week ago - By default, Anthropic's Claude models have a 200,000 token context window enabling you to relay a large volume of information to Claude. This translates to roughly 150,000 words, or over 500 pages of material. Sonnet 4 and 4.5 now offers an expanded context length of 1 million tokens (preview).