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🌐 claudeneptune.online
N3
Your comprehensive source for Claude Neptune v3 information. Anthropic's next-generation AI model currently undergoing final safety testing with breakthrough mathematical reasoning capabilities.
Beta Testing Phase - Expected Q3 2025 Release
2025-05-18
Internal Red Team Testing Originally Scheduled to End
Final round of safety testing deadline, but Anthropic extended the security audit cycle
Early 2025-06
Community Predicted Release Window (Missed)
Originally planned for first week of June, but still in closed beta phase
2025-07-07
Current Status: Limited Gray Testing
Still in "closed beta/whitelist" phase, with limited external developers gaining access
2025-Q3
Expected Official Release
Likely to be released as Claude 4 series, specific timing pending official confirmation
| Math/Logic Reasoning | Slightly weaker than GPT-4o | Significantly ahead in red team test bank, stable at mid-high level math problems | OpenTools bulletin confirmation |
| Code Generation | Top-tier in SWE-bench | Continued strengthening, targeting GPT-5 level | Cursor IDE in-depth report |
| Context Window | 200K tokens | "200K+", possibly further expanded | Internal testing data |
| Multimodal | Text + Static Images | Enhanced complex image and table understanding | Multiple source confirmation |
| Safety Policy | Constitutional AI v2 | v3: Focus on hardening jailbreaking and value alignment | Red team testing focus |
Mathematical Reasoning Breakthrough
Can match OpenAI o3 Pro and Google Kingfall, with significantly leading math performance in red team tests
Architecture Design
"Neptune = 8th planet", community speculates as Claude 3.8 internal codename, v3 as third major iteration
Code Generation Capability
Top-tier in SWE-bench benchmarks, targeting GPT-5 level programming capabilities
Multimodal Enhancement
Improved image and table understanding, supporting complex visual analysis tasks
Context Extension
Further expanded from 200K tokens, possibly supporting 256K or 512K tokens
Safety Level
ASL-3 safety tier certified, with "high capability and threat potential" security assurance
| 2025-Q1 | Claude 3.7 Sonnet | GPT-4o | Gemini Ultra |
| 2025-Q3? | Neptune v3 / Claude 4? | GPT-5 (In Development) | Gemini Ultra v2 |
Anthropic Neptune v3
Advantages: Enhanced safety + code + high context
Target Market: B2B markets with extreme requirements for long-form reasoning + compliance (finance, legal, research)
OpenAI GPT-5
Advantages: Tool calling + voice multimodal
Target Market: Consumer applications and general AI assistants
Google Gemini Ultra v2
Advantages: Extreme context & native multimodal
Target Market: Enterprise search and data analysis
Prepare Use Cases in Advance
- Organize high-context requirements like long contracts and source code repositories
- Prepare chunking strategies for quick A/B testing upon release
- Evaluate current application token usage
API Compatibility
- Following Anthropic's pattern, new models can use model parameter replacement
- Function calling schema remains largely unchanged
- Prepare API migration and version management strategies
Safety Strategy Testing
- Prepare prompt-hacking/jailbreaking test scripts
- Verify Constitutional AI v3 guardrail impacts
- Ensure business processes aren't disrupted by security mechanisms
Budget & Access
- Reserve trial quotas, calculate per-token cost differences
- Monitor access methods: Claude.ai Web, official API, AWS Bedrock, etc.
- Consider third-party aggregation platform payment solutions
Claude Neptune v3 is currently undergoing rigorous red team testing, with Anthropic extending the safety audit cycle to ensure model security. The model is classified as ASL-3 safety tier, applicable to models with "high capability and threat potential."
Based on the Constitutional AI v3 framework, it focuses on hardening jailbreaking and value alignment issues, ensuring safety while providing powerful capabilities.
Key Outstanding Questions
- 🔍 Official naming & tiers: New positioning for Opus/Sonnet/Haiku?
- 📏 Actual context limits: 256K, 512K, or MoE dynamic window?
- 🎨 Multimodal depth: Release strategy for image, audio, video parsing
- ⚖️ Reasoning consistency: Does math capability leap affect writing fluency?
- 💰 Commercialization path: Price tiers and access methods
- 🕐 Release timing: Specific time window within 2025-Q3
