Opus 4.8
Opus 4.8 is Anthropic's language model that served as a baseline before the company released Opus 5 two months later, which focused on cost efficiency rather than capability improvements. Recent benchmarks show Opus 4.8 performing at 8.3% on the Remote Labor Index and being outperformed by newer models like OpenAI's GPT-5.6 Luna at significantly lower cost, while also serving as a reference point for capability comparisons across competing AI systems.
Updated 3 August 2026
Specifications
No specifications recorded yet.
Latest developments
Anthropic's Opus 5 is about token efficiency, not a capability leap
Ars Technica · 1 week ago ·
12
Anthropic launches Opus 5
TechCrunch AI · 1 week ago ·
10
China’s Low-Priced Z.ai Model Is Exposing Costly Coder Habits
IEEE Spectrum AI · 1 week ago ·
10
Kimi K3 tops Arena’s coding leaderboard — and it’s open-weight
The New Stack · 2 weeks ago ·
48
Moonshot’s upcoming Kimi 3 is expected to close the gap with Anthropic’s Opus 4.8
TechCrunch AI · 2 weeks ago ·
14
datasette code-frequency chart on GitHub
Simon Willison · 2 weeks ago ·
29
Fable 5 Vs Opus 4.8: Outcomes-Based Assessments Are A Massive Warning For Frontier AI Labs
TLDR Dev · 3 weeks ago ·
10
[AINews] OpenAI launches GPT 5.6 Sol/Terra/Luna, Codex becomes ChatGPT superapp
Latent Space · 3 weeks ago ·
47
July 2026
Anthropic releases Claude Opus 5, matching Fable 5 capabilities at half the price Model release
Moonshot AI releases Kimi K3, a 2.8 trillion parameter open-weight model achieving frontier-class performance Open source release
Moonshot AI releases Kimi K3, a 2.8 trillion parameter open-weight model with API pricing and delayed weights availability Model release
Moonshot AI releases Kimi K3, a 2.8 trillion-parameter open-weight model competing with frontier American systems Model release
OpenAI releases GPT-5.6 model family with three tiers (Luna, Terra, Sol) and new multi-agent capabilities Model release
Claude Fable 5 Achieves 16.1% Automation Rate on Remote Labor Benchmark Benchmark result
- Anthropic's Opus 5 is about token efficiency, not a capability leap
- Anthropic launches Opus 5
- China’s Low-Priced Z.ai Model Is Exposing Costly Coder Habits
- Kimi K3 tops Arena’s coding leaderboard — and it’s open-weight
- Moonshot’s upcoming Kimi 3 is expected to close the gap with Anthropic’s Opus 4.8
- datasette code-frequency chart on GitHub
- Fable 5 Vs Opus 4.8: Outcomes-Based Assessments Are A Massive Warning For Frontier AI Labs
- [AINews] OpenAI launches GPT 5.6 Sol/Terra/Luna, Codex becomes ChatGPT superapp
- Claude Fable 5 Scores 16.1% on Remote Labor Index
June 2026
Relationships
Products & technology
- Anthropic develops this model · 5 sources