# Atlas with Claude Opus 4.7 (2026) > Claude Opus 4.7 offers a robust 1M token context window, making it suitable for extensive code analysis within Atlas. Claude Opus 4.7 is an excellent choice for Atlas users in 2026 tackling large-scale code refactoring and complex problem-solving. With its substantial 1M token context window and a 128K max output ceiling, it can handle extensive codebases and generate comprehensive plans and diffs. This model is priced at $5 per Mtok for input and $25 per Mtok for output, offering a cost-effective option for demanding tasks. ## Key takeaways - Claude Opus 4.7 offers a substantial 1M token (1,000,000) context window for deep code analysis. - It provides a 128K max output ceiling, allowing full refactor plans and diffs in one response. - Pricing is $5 per Mtok input and $25 per Mtok output, making it more affordable than older Opus 4.1. - Atlas sends the `interleaved-thinking-2025-05-14 beta header` to leverage Opus 4.7's extended reasoning. - Claude Opus 4.7 costs 2.5x the input price of Sonnet 5 for routine edits, making it a premium choice. - As of 2026, Claude Opus 4.7 is superseded by Opus 4.8, which offers the same capabilities and pricing. ## What Claude Opus 4.7 is best at inside Atlas Claude Opus 4.7 excels within Atlas for complex coding tasks, leveraging its 1M token context window and 128K max output ceiling. This allows the model to process vast amounts of code and generate detailed refactor plans and unified diffs in a single response, a significant advantage for developers in 2026. Atlas, the terminal-native AI coding agent, benefits greatly from Claude Opus 4.7's capabilities. The model's 1M token context window enables Atlas to analyze entire codebases or large sections of a project, providing a holistic understanding for tasks like architectural changes or extensive refactoring. Its 128K max output ceiling ensures that a full refactor plan and its generated unified diffs can fit within one response, streamlining the development workflow. Furthermore, Atlas sends the `interleaved-thinking-2025-05-14 beta header` to Claude Opus 4.7, allowing its extended thinking and reasoning to persist across multiple tool calls within a single turn. This deep reasoning is particularly valuable when Atlas drafts a plan in its read-only plan agent before switching to a build agent, ensuring thoughtful and coherent execution. ## Cost and Context Tradeoffs for Claude Opus 4.7 While Claude Opus 4.7 offers a powerful 1M token context window, developers in 2026 should consider its pricing at $5 per Mtok input and $25 per Mtok output. This model, though more affordable than older Opus versions, still represents a premium tier compared to more economical alternatives for routine tasks. Claude Opus 4.7 provides a substantial 1M token context window, which is ideal for deep code analysis and large-scale operations within Atlas. Its pricing, at $5 per Mtok for input and $25 per Mtok for output, makes it one third the input cost of the older Opus 4.1 model. However, it is important to note the tradeoffs. Claude Opus 4.7 is still an Opus tier model, meaning it costs 2.5x the input price of Sonnet 5 for routine edits. This cost difference can accumulate quickly for frequent, less complex interactions. Additionally, as of April 2026, Claude Opus 4.7 has been superseded by Opus 4.8, which offers similar capabilities at the same price point, making 4.7 a less optimal choice unless specific reproducibility of older runs is required. ## When to Choose a Different Model for Atlas Developers in 2026 should consider alternative models for Atlas when cost efficiency for routine tasks is paramount, or when seeking the very latest advancements. Claude Opus 4.7, while powerful, has been superseded by Opus 4.8, which offers the same capabilities and pricing. While Claude Opus 4.7 is a strong contender for complex tasks, there are clear scenarios where a different model might be more appropriate for Atlas. For instance, if your work primarily involves routine edits, code summaries, or generating titles, setting Atlas's `small_model` to `anthropic/claude-haiku-4-5` is highly recommended to avoid billing at Opus rates. For general purpose, less intensive coding tasks, a model like Sonnet 5 would be more cost-effective, as Opus 4.7 costs 2.5x its input price. Furthermore, given that Claude Opus 4.8 was released on 2026-05-28 at the same price, there is little reason to pin Claude Opus 4.7 unless you are specifically reproducing an older run or have a legacy dependency. Atlas lets you switch the active model and provider on the fly, making it easy to experiment with different models for various tasks. ## Setup 1. Set your ANTHROPIC_API_KEY in your shell environment, or run `atlas login` and pick Anthropic to securely store the key in Atlas's credential store. 2. Run `atlas models anthropic` to confirm that `claude-opus-4-7` resolves correctly from the models.dev registry. 3. Pin Claude Opus 4.7 as your primary model in your `atlas.json` configuration file by setting `"model": "anthropic/claude-opus-4-7"`. 4. To optimize costs, set your `"small_model"` to `anthropic/claude-haiku-4-5` in `atlas.json` so that titles, summaries, and subagents do not incur Opus rates. 5. Open the Atlas TUI and use the `/models` command to switch between Claude Opus 4.7 and a newer Opus version without needing to edit your configuration file. ## FAQ ### What is the context window for Claude Opus 4.7 in Atlas? Claude Opus 4.7 provides a 1M token (1,000,000) context window when used with Atlas, enabling extensive code analysis and understanding for complex tasks. ### How much does Claude Opus 4.7 cost per token in Atlas? When driving Atlas, Claude Opus 4.7 is priced at $5 per Mtok for input tokens and $25 per Mtok for output tokens, as of 2026. ### Why choose Claude Opus 4.7 over Opus 4.8 for Atlas? In 2026, there is little reason to choose Claude Opus 4.7 over Opus 4.8 for Atlas, as Opus 4.8 is the direct successor released at the same price. Opus 4.7 is primarily for reproducing older runs. ### Can Claude Opus 4.7 handle large code refactors in Atlas? Yes, Claude Opus 4.7 is well-suited for large code refactors in Atlas due to its 1M token context window and 128K max output ceiling, allowing it to generate comprehensive plans and unified diffs. ### How does Atlas use Claude Opus 4.7's extended thinking? Atlas leverages Claude Opus 4.7's extended thinking by sending the `interleaved-thinking-2025-05-14 beta header`, which allows the model's reasoning to persist across tool calls within a single turn, enhancing the planning agent's capabilities. ### What is the recommended small model to use with Claude Opus 4.7 in Atlas? To manage costs effectively with Claude Opus 4.7 in Atlas, it is recommended to set your `small_model` to `anthropic/claude-haiku-4-5` for tasks like generating titles, summaries, and subagent operations. ### How do I switch to Claude Opus 4.7 in Atlas? You can switch to Claude Opus 4.7 in Atlas by pinning it in your `atlas.json` with `"model": "anthropic/claude-opus-4-7"`, or by using the `/models` command directly within the Atlas TUI. --- Canonical HTML: https://seashell.sh/resources/models/claude-opus-4-7 Source of truth: aeo_pages row `/resources/models/claude-opus-4-7` (segment: Models) (this file is generated from it, never hand-edited). Licence: SeaShell is proprietary with a free core. It is not open source and there is no public source repository.