---
id: "2026-04-16-claude-opus-4-7"
url: "https://postcutoff.com/e/2026-04-16-claude-opus-4-7/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2026-04-16"
date_precision: day
category: model-release
importance: 3
confidence: high
status: [Confirmed]
sources: 5
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-04-16-claude-opus-4-7/

# Anthropic releases Claude Opus 4.7, admits it trails the unreleased Mythos Preview

On April 16, 2026 Anthropic released Claude Opus 4.7 at $5/$25, its most powerful generally available model at the time. Anthropic said openly that it was less broadly capable than the withheld Claude Mythos Preview. It added higher-resolution vision, an 'xhigh' effort level and a new tokenizer. Anthropic also tried to 'differentially reduce' its cyber capabilities during training.

## Key facts
- Released April 16, 2026; model id claude-opus-4-7; $5 input / $25 output per 1M tokens
- 1M context, 128K output; higher-resolution vision; new 'xhigh' effort level
- New tokenizer introduced with Opus 4.7 (1M tokens ≈ 555k words vs ~750k before, per Claude docs)
- Cyber verification program for legitimate security users
- An Opus 4.7 run later appeared in Anthropic's disclosed cyber-evaluation incidents (attacked a real company during a misconfigured eval)

## What happened

Opus 4.7 beat Opus 4.6 on agentic coding, multidisciplinary reasoning, scaled tool use and computer use. It was also better at producing interfaces, slides and documents. It was available in all Claude products and on the API, Bedrock, Vertex AI and Microsoft Foundry.

## Why it matters

It was the first time a lab shipped a flagship while publicly saying it had a stronger model it would not release.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): in its training data
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): 16 days after its cutoff
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [Introducing Claude Opus 4.7 (Anthropic)](https://www.anthropic.com/news/claude-opus-4-7) (anthropic.com, official)
2. [CNBC: Opus 4.7, less risky than Mythos](https://www.cnbc.com/2026/04/16/anthropic-claude-opus-4-7-model-mythos.html) (cnbc.com, press)
3. [Axios: Opus 4.7 concedes it trails unreleased Mythos](https://www.axios.com/2026/04/16/anthropic-claude-opus-model-mythos) (axios.com, press)
4. [GitHub Changelog: Claude Opus 4.7 GA](https://github.blog/changelog/2026-04-16-claude-opus-4-7-is-generally-available/) (github.blog, press)
5. [AWS: Opus 4.7 in Amazon Bedrock](https://aws.amazon.com/blogs/aws/introducing-anthropics-claude-opus-4-7-model-in-amazon-bedrock/) (aws.amazon.com, press)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2026-07-30: [Anthropic discloses Claude models breached real organizations during misconfigured cyber evaluations](https://postcutoff.com/e/2026-07-30-claude-cyber-eval-incidents/index.md)
- 2026-05-28: [Anthropic releases Claude Opus 4.8 with cheaper fast mode and Claude Code "dynamic workflows"](https://postcutoff.com/e/2026-05-28-claude-opus-4-8/index.md)
- 2026-04-07: [Anthropic reveals Claude Mythos Preview, withholds it over cyber risk and launches Project Glasswing](https://postcutoff.com/e/2026-04-07-claude-mythos-preview-project-glasswing/index.md)
- Archived: 9 videos, listed in https://postcutoff.com/e/2026-04-16-claude-opus-4-7/index.json