We've just made Swiftask smarter. OpenAI's GPT-5.3 is now available across all plans, bringing cutting-edge reasoning and logic capabilities to every team member. No upgrades. No extra costs. Just better thinking.

GPT-5.3 — Advanced reasoning for your toughest problems

GPT-5.3 is the most advanced model in the GPT-5 family. It delivers superior logic and coding capabilities, with deep reasoning and complex instruction following built in. Whether you're solving intricate problems, writing sophisticated code, or working through multi-step logic, GPT-5.3 gets it right.

Why it matters: This is the highest level of intelligence available right now. Use it when you need your AI to think harder, reason deeper, and handle complexity that other models struggle with.

• Advanced reasoning – Tackles multi-step problems with precision

• Superior logic & coding – Writes better code, catches edge cases, explains complex logic

• Deep reasoning & complex instruction following – Understands nuanced requirements and delivers accordingly

• Performance – Outperforms GPT-4o on MMLU and GSM8K benchmarks

• Available on all plans – Pro, Team Starter, Team Growth, and Custom at no extra cost

How to use GPT-5.3

In Chat:

1. Open Chat in the left sidebar

2. Click the AI model selector (top left, showing your current model)

3. Search for or select "OpenAI GPT-5.3" from the dropdown

4. Start your conversation — GPT-5.3 is ready to go

Set it as your default:

1. Go to Workspace administration → Settings → Advanced

2. Find Default Chat AI

3. Select "OpenAI GPT-5.3"

4. Click Update

All new conversations will now use GPT-5.3 by default.

How to test it

Try GPT-5.3 on tasks where reasoning matters most:

• Code review – Ask it to analyze complex code, identify bugs, suggest optimizations

• Research & analysis – Complex document analysis, data synthesis, strategic thinking

• Problem-solving – Multi-step logic, edge case handling, constraint satisfaction

• Writing & explanation – Nuanced writing, technical explanations, instruction generation

Start a conversation with a challenging prompt and see the difference advanced reasoning makes.