Aion-2.0 is a variant of DeepSeek V3.2 optimized for immersive roleplaying and storytelling. It is particularly strong at introducing tension, crises, and conflict into stories, making narratives feel more engaging....
Model details →AionLabs: Aion-2.0 vs Claude Opus 5 (Fast)
AionLabs: Aion-2.0 and Claude Opus 5 (Fast) are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
Fast-mode variant of [Opus 5](/anthropic/claude-opus-5) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 5. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-…
Model details →Side-by-side comparison
| Capability | AionLabs: Aion-2.0 | Claude Opus 5 (Fast) | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 131K | 1M | 🏆 Claude Opus 5 (Fast) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.80 | $10.00 | 🏆 AionLabs: Aion-2.0 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $1.60 | $50.00 | 🏆 AionLabs: Aion-2.0 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | — | Yes | 🏆 Claude Opus 5 (Fast) |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is AionLabs: Aion-2.0 better than Claude Opus 5 (Fast)?
AionLabs: Aion-2.0 and Claude Opus 5 (Fast) are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between AionLabs: Aion-2.0 and Claude Opus 5 (Fast)?
Input: $0.80 vs $10.00 per 1M tokens. Output: $1.60 vs $50.00 per 1M tokens.
What context windows do AionLabs: Aion-2.0 and Claude Opus 5 (Fast) support?
AionLabs: Aion-2.0 supports up to 131K tokens. Claude Opus 5 (Fast) supports up to 1M tokens.
Do both AionLabs: Aion-2.0 and Claude Opus 5 (Fast) support tool calling?
AionLabs: Aion-2.0: yes. Claude Opus 5 (Fast): yes.