> ## Documentation Index
> Fetch the complete documentation index at: https://docs.infery.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Choosing a model

> A pragmatic guide to picking between the major chat models.

Some opinionated advice on which model to pick for common use cases.

## Speed vs quality vs price

```
Fastest & cheapest:   gemini-2-5-flash, gpt-4o-mini, deepseek-v3, qwen-flash
Best quality/price:   gemini-2-5-pro, claude-sonnet-4-6, gpt-4o, qwen3-5-plus
Flagship (most $):    gpt-5.5, gpt-5.4, claude-opus-4.7, gemini-2-5-pro
Reasoning:            claude-opus-4.7, o3, qwq-plus, deepseek-reasoner
```

## Long context

Need >100k tokens? Sort by `maxContextTokens`:

* **qwen-long** — 10M tokens
* **grok-4.20** — 2M tokens
* **gemini-2-5-pro / flash** — 1M tokens
* **claude-opus-4.7 / 4.6 / sonnet-4.6** — 1M tokens
* **qwen3-5-plus / flash** — 1M tokens
* **gpt-5.5** — 272K tokens
* **gpt-5.4 / 5.2** — 200K tokens
* **gpt-4o** — 128K tokens

## Vision

For images in prompts:

* General-purpose: **gpt-4o** (best accuracy on OCR + natural images)
* Huge context (many images): **gemini-2-5-pro**
* Document-heavy (PDF + text): **claude-opus-4.7** or **qwen3-max**

## Coding

* **claude-opus-4.7** — step-change improvement in agentic coding over 4.6
* **claude-sonnet-4.6** — fast, great at code review and refactor
* **gpt-5.5 / 5.4** — strong on general programming
* **deepseek-v3** / **qwen3-coder-plus** — budget options for mass code gen

## Tool calling

All major flagships (gpt-5.5, gpt-5.4, claude-opus-4.7, gemini-2.5-pro, grok-4.20, qwen3-max, deepseek-v3) support `tools`. For best-reliability production agents, pick one and stick to it — don't round-robin.

## JSON mode / Structured Outputs

* **gpt-5.5 / 5.4 / o3** — best at strict JSON schema
* **gemini-2-5-pro** — excellent
* **claude-opus-4.7** — good; returns strict JSON when requested

## Cost-sensitive

Per million tokens (input/output, roughly):

* **qwen-flash** — $0.05 / $0.4
* **gemini-2-5-flash** — $0.075 / $0.3
* **deepseek-v3** — $0.14 / $0.28
* **gpt-4o-mini** — $0.15 / $0.6

Check live pricing via `GET /v1/models`.

## Fallback pairs

Safe production pairs (primary → fallback):

* `gpt-5.5` → `claude-opus-4.7` (cross-provider top-tier)
* `gpt-5.5` → `gpt-5.4` (within OpenAI, cheaper)
* `gpt-5.4` → `gpt-5.4-mini`
* `claude-opus-4.7` → `gpt-5.5` (cross-provider top-tier)
* `claude-opus-4.7` → `claude-sonnet-4.6`
* `gemini-2-5-pro` → `gemini-2-5-flash`
* `gpt-5.4` → `gemini-2-5-flash` (cross-provider safety)

Configure in Settings → Fallbacks. See [Fallback chains](/workspaces/fallback-chains).