claude opus 4 context window - Brave Search

anthropic.com › claude › opus

Claude Opus 4.5

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.

reddit.com › r/claudeai › claude 4 and still 200k context size

r/ClaudeAI on Reddit: Claude 4 and still 200k context size

May 22, 2025 -

I like Claude 3.7 a lot, but context size was the only downsize. Well, looks like we need to wait one more year for 1M context model.
Even 400K will be a massive improvement! Why 200k?

Used up my message rate limit in one message. I had it review my documents and advise on any "modern updates" it could do to my html. It then tried to one-shot everything, using up my limits, AND because it messed up in the middle of the message I lost everything it tried to give me. So next time I'll be very, very specific.

Still too computationally expensive it seems, DeepMind has a huge advantage with their TPUs when it comes to that. Same with Opus' output limit probably. A bit weird that the knowledge cutoff is March in the API but this in the new system message: Claude's reliable knowledge cutoff date - the date past which it cannot answer questions reliably - is the end of January 2025. Also tracks more with my earlier tests, end of January.

Videos

Claude Code just had a MAJOR update. Here's how to use it. - YouTube

Claude Opus 4.5: The only model you need - YouTube

Claude Just 5x'd Its Context Window - YouTube

August 14, 2025

New SONNET 4 Update: FINALLY Claude Has 1 MIL CONTEXT WINDOW - YouTube

August 12, 2025

Cursor, Droid, Claude: Why Your Agent Forgets Rules - YouTube

prompthub.us › blog › the-complete-guide-to-claude-opus-4-and-claude-sonnet-4

PromptHub Blog: The Complete Guide to Claude Opus 4 and Claude Sonnet 4

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.

platform.claude.com › docs › en › about-claude › models › whats-new-claude-4-5

What's new in Claude 4.5 - Claude Docs

Combined with more effective context window usage and our new context management API features, the model optimally handles information across extended sessions to maintain coherence over time. Context awareness is available in Claude Sonnet 4, Sonnet 4.5, Haiku 4.5, Opus 4, Opus 4.1, and Opus 4.5.

llm-stats.com › home › models › claude opus 4

Claude Opus 4: Pricing, Context Window, Benchmarks, and More

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.

BleepingComputer

bleepingcomputer.com › home › news › artificial intelligence › claude 4 benchmarks show improvements, but context is still 200k

Claude 4 benchmarks show improvements, but context is still 200K

May 22, 2025 - Today, OpenAI rival Anthropic announced Claude 4 models, which are significantly better than Claude 3 in benchmarks, but we're left disappointed with the same 200,000 context window limit.

blog.milvus.io › ai-quick-reference › whats-the-recommended-context-window-size-for-claude-opus-45-production-workloads

What’s the recommended context window size for Claude Opus 4.5 production workloads?

Claude Opus 4.5 supports a 200K-token context window, but for production workloads developers are encouraged to use smaller, focused contexts—often 20K–80K tokens per requestexcept for occasional large tasks.

reddit.com › r/claudecode › the context window simply needs to be larger with opus as the default

r/ClaudeCode on Reddit: The context window simply needs to be larger with Opus as the default

November 25, 2025 -

I'm on the 20x Max plan. I get that Opus will use tokens faster, and Anthropic acknowledged this by increasing the total token usage to be something equivalent to the same amount of usage you'd get with Haiku (whether or not that is really true remains to be seen). However, they didn't raise the context window token limit of 200k (I don't have access to the 1M limit).

I just used my first prompt (which was a pretty standard one for me) to help find an issue that threw an error on my front-end, and after its response (which wasn't that helpful), I'm already down to 9% context remaining before auto-compacting.

If Anthropic is going to acknowledge that token consumption will be higher with Opus and scale some of the limits up accordingly, they really should increase the context limit as well.

Opus 4.5 does not use tokens faster. In fact in many cases, Anthropic tests showed Opus uses fewer tokens (because it gets to the right answer more directly). Set to a medium effort level, Opus 4.5 matches Sonnet 4.5’s best score on SWE-bench Verified, but uses 76% fewer output tokens. At its highest effort level, Opus 4.5 exceeds Sonnet 4.5 performance by 4.3 percentage points—while using 48% fewer tokens. And since Opus 4.5 is also less expensive per token than Opus 4.1, this means it often costs the same or less in $$ when paying for raw tokens for Opus 4.5 than for Sonnet 4.5. That is why their raised the usage limits. The old limits were to stop people from using a very expensive and not more efficient model. The new model is more efficient and more effective and doesn't cost them more on average.

Preserve the main context for actual useful work - Use sub agents, the main should basically be the orchestration and leave all the 'grunt work' to subs.

chatbase.co › blog › claude-4

Claude 4: How to Access and Use It

But with a 200k context window, you can feed it hundreds of pages of PDFs, documentation, or code, and it won’t blink. Claude 4 comes in two variations: Claude Sonnet and Claude Opus.

Find elsewhere

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anthropic.com › news › claude-opus-4-5

Introducing Claude Opus 4.5

4: A fetch-enabled version of BrowseComp-Plus. Specifically, the improvement was from 70.48% without using the combination of techniques to 85.30% using it. ... All evals were run with a 64K thinking budget, interleaved scratchpads, 200K context window, default effort ...

LLM Leaderboard

llm-stats.com › blog › research › claude-opus-4.5-launch

Claude Opus 4.5: Complete Guide, Pricing, Context Window, Benchmarks, and API

2 weeks ago - A comprehensive look at Claude Opus 4.5 - Anthropic's flagship AI model with 80.9% SWE-bench, 200K context window, Memory Tool, pricing at $5/$25 per 1M tokens, and what it means for developers and enterprises.

medium.com › @leucopsis › claude-sonnet-4-and-opus-4-a-review-db68b004db90

Claude Sonnet 4 and Opus 4, a Review | by Barnacle Goose | Medium

May 29, 2025 - Notably, Claude 4 retains the context window of 200,000 tokens. Which is much lower than that of GPT4.1 or of Gemini models. However, according to Anthoropic, it further improves the AI’s ability to utilize that context effectively.

claudelog.com › home › faqs › what is context window

What is Context Window in Claude Code | ClaudeLog

Context window in Claude Code determines conversation memory capacity. Manage effectively with strategic chunking and avoid depletion for optimal performance.

medium.com › @leucopsis › claude-opus-4-5-review-1d9b46bb053a

Claude Opus 4.5 - First Look. When Anthropic released Claude Opus 4.5… | by Barnacle Goose | Nov, 2025 | Medium

3 weeks ago - Earlier parts of a conversation or project are summarised and re-encoded so that logically important constraints are preserved even when the raw text has been pushed far into the past. But I think the base Opus 4.5 context window remained the same as before i.e. 200K. In API one can use the new memory tool that enables Claude to store and retrieve information outside the context window.

thenewstack.io › home › anthropic’s claude sonnet 4 model gets a 1m token context window

Anthropic's Claude Sonnet 4 Model Gets a 1M Token Context Window - The New Stack

August 12, 2025 - Anthropic today updated its Claude Sonnet 4 model to support a context window of up to 1 million tokens. ... Anthropic today announced that its Claude Sonnet 4 model, the company’s mainstream model that sits below its flagship Claude Opus ...

datacamp.com › blog › claude-4

Claude 4: Tests, Features, Access, Benchmarks & More | DataCamp

May 23, 2025 - It’s built for tasks that require ... problem solving, and extended research workflows. Like Sonnet 4, it supports a 200K context window, so this can be a disadvantage if you want to use it with a large codebase...

datastudios.org › post › claude-opus-4-5-vs-claude-sonnet-4-5-model-differences-pricing-structure-context-windows-and-mor

Claude Opus 4.5 vs Claude Sonnet 4.5: Model Differences, Pricing Structure, Context Windows, and more

November 25, 2025 - Opus 4.5 focuses on higher reasoning quality within its large context rather than maximum window expansion, prioritizing structured logic, better dependencies across segments and superior performance under cognitive load.

simonw.substack.com › p › claude-opus-45-and-why-evaluating

Claude Opus 4.5, and why evaluating new LLMs is increasingly difficult

November 25, 2025 - The model supports enhanced computer use, specifically a zoom tool which you can provide to Opus 4.5 to allow it to request a zoomed in region of the screen to inspect. “Thinking blocks from previous assistant turns are preserved in model context by default“ - apparently previous Anthropic models discarded those. I had access to a preview of Anthropic’s new model over the weekend. I spent a bunch of time with it in Claude Code, resulting in a new alpha release of sqlite-utils that included several large-scale refactorings - Opus 4.5 was responsible for most of the work across 20 commits, 39 files changed, 2,022 additions and 1,173 deletions in a two day period.

reddit.com › r/claudeai › context length limits finally solved!

r/ClaudeAI on Reddit: Context Length limits finally SOLVED!

November 24, 2025 -

With the introduction of Opus 4.5, Anthropic just updated the Claude Apps (Web, Desktop, Mobile):

For Claude app users, long conversations no longer hit a wall—Claude automatically summarizes earlier context as needed, so you can keep the chat going.

This is so amazing and was my only gripe I had with Claude (besides limits), and why I kept using ChatGPT (for the rolling context window).

Anyone as happy as I am?

People on this sub have reported that when it compresses it, you lose a lot of performance and context from the compressed data... I wouldn't celebrate just yet.

We acquired & solved Context length limits and Opus limits before GTA6. 2025 has been something else.

blog.getbind.co › 2025 › 08 › 13 › claude-sonnet-4-with-1-million-context-window-is-here

Claude Sonnet 4 with 1 Million Context Window Is Here – Bind AI IDE

August 13, 2025 - Anthropic’s latest update brings a massive one-million-token context window to Claude Sonnet 4 (not to be confused with Claude Opus 4). That’s a fivefold jump from its previous limit of 200K tokens…