Expand model tag support: add GLM-5.1, simplify Anthropic IDs, scan tags anywhere in message

- Flink update_bars debouncing
- update_bars subscription idempotency bugfix
- Price decimal correction bugfix of previous commit
- Add GLM-5.1 model tag alongside renamed GLM-5
- Use short Anthropic model IDs (sonnet/haiku/opus) instead of full version strings
- Allow @tags anywhere in message content, not just at start
- Return hasOtherContent flag instead of trimmed rest string
- Only trigger greeting stream when tag has no other content
- Update workspace knowledge base references to platform/workspace and platform/shapes
- Hierarchical knowledge base catalog
- 151 Trading Strategies knowledge base articles
- Shapes knowledge base article
- MutateShapes tool instead of workspace patch
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---
description: "A sideways income strategy selling an OTM call at K1 and an OTM put at K2 < K1, collecting premium with a wider profit zone than a short straddle but lower credit."
tags: [options, income, neutral, strangle]
---
# Short Strangle
**Section**: 2.26 | **Asset Class**: Options | **Type**: Income
## Overview
The short strangle is a sideways strategy consisting of a short position in an OTM call option with strike K1 and a short position in an OTM put option with strike K2 (K2 < K1). This is a net credit trade. Since both options are OTM, this strategy is less risky than a short straddle position; the flipside is that the initial credit is also lower. The trader's outlook is neutral. This is an income strategy.
## Construction
- Sell 1 OTM call option at strike K1
- Sell 1 OTM put option at strike K2 (K2 < K1), same expiry
Net credit: C
## Payoff Profile
f_T = -(S_T - K1)+ - (K2 - S_T)+ + C
- Upper breakeven: S*_up = K1 + C
- Lower breakeven: S*_down = K2 - C
- Max profit: P_max = C (if K2 <= S_T <= K1 at expiry; both options expire worthless)
- Max loss: L_max = unlimited (stock can move far in either direction)
## Key Conditions / Signals
- Neutral view; expects stock to remain between K2 and K1 through expiry
- High implied volatility environment makes the collected credit larger
- Wider profit zone than a short straddle, but smaller credit collected
## Notes
Unlimited risk in both directions once the stock moves outside [K2, K1]. The position is short vega and long theta. Less risky than the short straddle but still requires active management for large moves.