Anthropic releases Claude Opus 4.7, admits it trails the unreleased Mythos Preview
Confirmed
The takeaway
On April 16, 2026 Anthropic released Claude Opus 4.7 at $5/$25, its most powerful generally available model at the time.
Status
- Claim
Confirmed
- Our reporting
- High confidence
- Importance
- 3 of 5
- Last verified
- 29 September 2026
Your AI and this story
- GPT-6 AstraIn its training data
- Claude Opus 5.5In its training data
- Gemini 4 Hydrogen16 days after its cutoff
- Grok 4.7In its training data
It is after the cutoff of Gemini 4 Hydrogen, and can be in the training data of GPT-6 Astra, Claude Opus 5.5 and Grok 4.7.
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.
Sources
5 sources from 5 sites. Numbers match the chips in the text.
5 sources: 1 primary, 4 press
Primary
- Introducing Claude Opus 4.7 (Anthropic)anthropic.com, official
Press
- CNBC: Opus 4.7, less risky than Mythoscnbc.com, press
- Axios: Opus 4.7 concedes it trails unreleased Mythosaxios.com, press
- GitHub Changelog: Claude Opus 4.7 GAgithub.blog, press
- AWS: Opus 4.7 in Amazon Bedrockaws.amazon.com, press
Changes
- Filed
