AI Model Guide

What each model is, what it's best at, and how they compare — in plain language.

AscendSync Code lets you choose from 10 AI models made by 8 different companies. Think of them like specialists on a team: some are deep thinkers for hard strategy, some are fast and inexpensive for quick questions, and some shine at long documents or multiple languages. You can switch models any time from the dropdown at the top of the chat — your conversation carries over.

Not sure which to pick? Start with the default. If an answer feels shallow, switch to a higher-reasoning model. If you're doing lots of quick, simple tasks, a lower-cost model will be faster and cheaper.

Already use ChatGPT, Copilot, or Gemini? Here's how they map

If you've used another AI assistant, you've probably already used one of these model families — just inside a different app. Here's the closest match in our lineup.

Tool you know	Closest model here	Why
ChatGPT by OpenAI	GPT-5.5 · GPT-5.5 Pro	The same family that powers ChatGPT. GPT-5.5 matches the standard experience; Pro is the deeper, slower ‘thinking’ tier for hard problems.
Microsoft Copilot by Microsoft	GPT-5.5	Copilot is a Microsoft product, but under the hood it runs on OpenAI's GPT models. So if you're used to Copilot, GPT-5.5 will feel the most familiar — not Microsoft Phi-4, which is Microsoft's own smaller, budget model.
Claude by Anthropic	Claude Sonnet 4.6 · Claude Opus 4.8	The same models you'd use on claude.ai — Sonnet for balanced everyday work, Opus for the heaviest reasoning and long-form writing.
Gemini by Google	Gemini 3.1 Pro	The same family as Google's Gemini app — especially handy for long documents and images.
Grok by xAI	Grok 4.3	The same model behind Grok on X — strong on real-time, current-events questions.
Meta AI by Meta	Llama 4 Maverick	Built on Meta's open Llama models — a low-cost, capable all-rounder.

Reasoning power

How deeply a model thinks through complex, multi-step problems. Levels: Basic → Standard → Strong → Advanced → Frontier. More reasoning usually means a little slower and more expensive.

Relative cost

Roughly how expensive a model is per message. Fewer dollar signs = cheaper. Most everyday questions cost a fraction of a cent regardless of model. Levels: $ Very low → $ Low → $$ Mid → $$ High → $$$ Premium.

Models by provider

Microsoft

Model	Description	Best for	Reasoning	Cost
Microsoft Phi-4	Microsoft's compact, fast model — efficient for everyday tasks at very low cost	Quick everyday tasks at the lowest cost	Standard	$ Very low

Model	Description	Best for	Reasoning	Cost
Llama 4 Maverick	Open-source leader for creative and general tasks	Creative & open-ended tasks	Strong	$ Very low

DeepSeek

Model	Description	Best for	Reasoning	Cost
DeepSeek V4 Pro	Top-tier reasoning and code generation at exceptional value	Reasoning & code at low cost	Advanced	$ Very low

xAI

Model	Description	Best for	Reasoning	Cost
Grok 4.3	Real-time knowledge with strong reasoning and humor	Real-time knowledge & a bit of wit	Advanced	$ Low

Mistral

Model	Description	Best for	Reasoning	Cost
Mistral Medium 3.5	Efficient European model, great for general business tasks	Efficient everyday business tasks	Strong	$$ Mid

Google

Model	Description	Best for	Reasoning	Cost
Gemini 3.1 Pro	Strong at reasoning, long context, and multimodal tasks	Long documents & images/multimodal	Advanced	$$ Mid

Anthropic

Model	Description	Best for	Reasoning	Cost
Claude Sonnet 4.6	Balanced Claude — excels at nuanced analysis and writing	Nuanced writing & careful analysis	Advanced	$$ High
Claude Opus 4.8	Anthropic's top tier — deepest reasoning, long-form writing, complex strategy	Long-form strategy & complex reasoning	Frontier	$$ High

OpenAI

Model	Description	Best for	Reasoning	Cost
GPT-5.5	OpenAI's flagship — strong all-around reasoning, coding, and analysis	General reasoning, coding & analysis	Frontier	$$ High
GPT-5.5 Pro	OpenAI's deepest reasoning variant — slow, expensive, best for hard problems	The hardest problems, deepest thinking	Frontier	$$$ Premium

Side-by-side comparison

Model	Provider	Reasoning	Cost	Best for
Microsoft Phi-4	Microsoft	Standard	$ Very low	Quick everyday tasks at the lowest cost
Llama 4 Maverick	Meta	Strong	$ Very low	Creative & open-ended tasks
DeepSeek V4 Pro	DeepSeek	Advanced	$ Very low	Reasoning & code at low cost
Grok 4.3	xAI	Advanced	$ Low	Real-time knowledge & a bit of wit
Mistral Medium 3.5	Mistral	Strong	$$ Mid	Efficient everyday business tasks
Gemini 3.1 Pro	Google	Advanced	$$ Mid	Long documents & images/multimodal
Claude Sonnet 4.6	Anthropic	Advanced	$$ High	Nuanced writing & careful analysis
Claude Opus 4.8	Anthropic	Frontier	$$ High	Long-form strategy & complex reasoning
GPT-5.5	OpenAI	Frontier	$$ High	General reasoning, coding & analysis
GPT-5.5 Pro	OpenAI	Frontier	$$$ Premium	The hardest problems, deepest thinking

Cost is a relative guide, not a bill — most everyday questions cost a fraction of a cent. Ratings are AscendSync's own estimates and may change as providers update pricing and models.