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 14 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-5.6 Sol · Terra · Luna	The same family that powers ChatGPT. GPT-5.6 Terra matches the standard everyday experience; Sol is the deeper, slower ‘thinking’ tier for the hardest problems; Luna is the fast, low-cost option.
Microsoft Copilot by Microsoft	GPT-5.6 Terra	Copilot is a Microsoft product, but under the hood it runs on OpenAI's GPT models. So if you're used to Copilot, GPT-5.6 Terra 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 · Claude Opus 5	The same models you'd use on claude.ai — Sonnet for balanced everyday work, Opus 4.8 for heavy reasoning and long-form writing, and Opus 5, Anthropic's newest flagship, for the most demanding reasoning and agentic tasks.
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 4.5 · Grok 4.3	The same family behind Grok on X — 4.5 is the flagship for hard coding and agentic work; 4.3 stays 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	Analytical & versatile — best overall value for reasoning, coding, and everyday business work	Best value: reasoning, coding & business work	Advanced	$ Very low
DeepSeek V4 Flash	DeepSeek's newest (July 2026) — beats V4 Pro on benchmarks with faster responses at rock-bottom cost	Fast everyday reasoning at minimal 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
Grok 4.5	xAI's flagship — frontier coding and agentic work, trained with real developer workflows	Hard coding & agentic tasks	Frontier	$$ Mid

Mistral

Model	Description	Best for	Reasoning	Cost
Mistral Medium 3.5	Polished & efficient — refined business writing, structured extraction & categorization, and multilingual work at fair cost	Polished writing & structured extraction	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	Anthropic's balanced Claude — nuanced analysis and writing at a fair price	Nuanced writing & careful analysis	Advanced	$$ Mid
Claude Opus 4.8	Anthropic's proven workhorse — deep reasoning, long-form writing, complex strategy	Long-form strategy & complex reasoning	Frontier	$$ High
Claude Opus 5	Anthropic's newest flagship (July 2026) — near-Fable-5 frontier intelligence at half the cost, top-tier coding and agentic work	The most demanding reasoning & agentic tasks	Frontier	$$ High

OpenAI

Model	Description	Best for	Reasoning	Cost
GPT-5.6 Sol	OpenAI's flagship — leading performance on the hardest coding, knowledge, cybersecurity, and science tasks	The hardest problems, deepest thinking	Frontier	$$$ Premium
GPT-5.6 Terra	OpenAI's balanced everyday model — GPT-5.5-level quality at lower cost	General reasoning, coding & analysis	Frontier	$$ Mid
GPT-5.6 Luna	OpenAI's fastest, most affordable model — best for well-defined, high-volume work	Fast, high-volume everyday work	Strong	$ Very low

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	Best value: reasoning, coding & business work
DeepSeek V4 Flash	DeepSeek	Advanced	$ Very low	Fast everyday reasoning at minimal cost
Grok 4.3	xAI	Advanced	$ Low	Real-time knowledge & a bit of wit
Grok 4.5	xAI	Frontier	$$ Mid	Hard coding & agentic tasks
Mistral Medium 3.5	Mistral	Strong	$$ Mid	Polished writing & structured extraction
Gemini 3.1 Pro	Google	Advanced	$$ Mid	Long documents & images/multimodal
Claude Sonnet 4.6	Anthropic	Advanced	$$ Mid	Nuanced writing & careful analysis
Claude Opus 4.8	Anthropic	Frontier	$$ High	Long-form strategy & complex reasoning
GPT-5.6 Sol	OpenAI	Frontier	$$$ Premium	The hardest problems, deepest thinking
GPT-5.6 Terra	OpenAI	Frontier	$$ Mid	General reasoning, coding & analysis
GPT-5.6 Luna	OpenAI	Strong	$ Very low	Fast, high-volume everyday work
Claude Opus 5	Anthropic	Frontier	$$ High	The most demanding reasoning & agentic tasks

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.