Apex mode

What Apex is

Apex routes the current Niyra conversation through Claude Opus 4 / Fable 5 — Anthropic's top tier model. It's roughly 5-10x the cost of Sonnet, slower, and significantly better at complex reasoning.

Prerequisites

1. Alpha access — Apex is gated to early users today. Email hi@niyra.ai for access.
2. BYOK Anthropic key — Apex is BYOK-only. Set up BYOK first.

Turning it on

Per-conversation. From the chat surface:

1. Open a chat
2. Click the model selector (next to your input)
3. Pick "Apex (Fable 5)"
4. The orb's color shifts to indicate Apex mode

The whole thread runs on Apex until you turn it off.

When to use Apex

- Deep research — synthesizing many sources into a clean argument
- Complex planning — long horizon, many constraints, real trade-offs
- Subtle reasoning — legal-adjacent work, financial analysis, edge cases
- High-stakes drafting — investor letters, board memos, strategic docs

For daily email triage, scheduling, summaries — Sonnet is the right tool. Apex is overkill.

What it costs

Runs on your Anthropic vendor budget (BYOK). Typical message costs $0.05-$0.25 depending on context size. A complex research session might run $1-$3.

The conversation shows the running cost so you can decide when to stop.

Limits

- No failover — if your vendor quota runs out, the conversation pauses until you top up.
- Voice mode isn't supported with Apex (yet).
- Some tools (especially Composio integrations) still run on Sonnet for cost reasons — only the reasoning step is Apex.

Troubleshooting

- "Apex unavailable" — Either you don't have alpha access (email hi@niyra.ai) or your BYOK key isn't set.
- Cost higher than expected — Apex context windows are larger; long conversations with memories injected can grow fast. Start fresh chats for new topics.