> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apiyi.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Grok 4.3 launches: xAI's new flagship, 37.5% input / 58.3% output price cuts
> xAI shipped Grok 4.3 on April 30, 2026: Intelligence Index 53, GDPval-AA ELO 1500, τ²-Bench 98%, IFBench 81%, 159 tokens/s. Listed at just \$1.25 / \$2.50 per 1M tokens, available on all common groups, ~85% of upstream pricing after the 10% recharge bonus.
## Key Highlights
* **xAI's new flagship** — Grok 4.3 (April 30, 2026), positioned for "lowest hallucination rate, strongest agentic tool calling, best instruction following"
* **Major price cuts** — input down **37.5%** and output down **58.3%** vs. Grok 4.20 0309 v2; full Intelligence Index eval costs about 20% less
* **Blazing fast** — 159 tokens/s output, well above the 64.6 t/s median for same-tier reasoning models
* **Million-token context + multimodal** — 1M context window, text + image input, always-on reasoning (cannot be disabled)
* **All common groups available** — Default, SVIP, etc. all open; **deposit \$100 get 10% bonus, \~85% of xAI's upstream pricing**
## Background
On April 30, 2026 (UTC+8), xAI shipped **Grok 4.3** as the next flagship after Grok 4.20. The headline isn't a benchmark sweep — it's a **cost-performance leap**: a score of 53 on the Artificial Analysis Intelligence Index with the full eval suite costing only \$395 to run, \~20% cheaper than Grok 4.20 0309 v2.
xAI's official positioning calls out "industry-leading non-hallucination rate, agentic tool calling, and instruction following" — three dimensions all targeted at production-grade agent workloads. On the Intelligence Index, Grok 4.3 edges past Claude Sonnet 4.6; the single biggest jump is on GDPval-AA, where ELO leapt from Grok 4.20 v2's 1179 straight to **1500** — a 321-point one-generation gain.
APIYI has shipped Grok 4.3 with **all common user groups (Default, SVIP, etc.) open** — pricing is friendly, blast radius is contained, no need to gate it like GPT-5.5 Pro. Stack the 10% deposit bonus and effective cost lands around 85% of xAI's upstream rate.
## Detailed Breakdown
### Core Capabilities
τ²-Bench Telecom 98%, IFBench 81%; stable on complex tool chains and multi-step agents
AA-Omniscience Accuracy +8 vs. previous; xAI claims industry-leading non-hallucination rate
159 tokens/s — 2.5× the 64.6 t/s median for same-tier reasoning models
1M tokens context, text + image input, always-on reasoning
### Benchmarks
| Benchmark | Grok 4.3 | Grok 4.20 v2 | Δ |
| --------------------------- | ----------- | ------------ | --------------------- |
| **Intelligence Index** | **53** | 49 | +4 |
| **GDPval-AA (ELO)** | **1500** | 1179 | **+321** |
| **τ²-Bench Telecom** | **98%** | — | Industry-leading |
| **IFBench** | **81%** | — | Instruction following |
| **AA-Omniscience Accuracy** | +8 vs. v2 | baseline | Accuracy lift |
| **Output speed** | **159 t/s** | lower | Big jump |
| **Cost to run Index** | **\$395** | \~\$494 | -20% |
Sources: xAI official announcement, Artificial Analysis independent benchmarks (April 30, 2026). The Intelligence Index aggregates multiple benchmarks and is a useful proxy for overall model intelligence.
### Tech Specs
| Parameter | Grok 4.3 |
| -------------------- | ------------------------------------------ |
| **Model name** | `grok-4.3` |
| **Context window** | 1,000,000 tokens |
| **Max output** | No explicit cap (within remaining context) |
| **Input modalities** | Text + image |
| **Reasoning mode** | Always-on reasoning (cannot be disabled) |
| **Output speed** | \~159 tokens/s |
| **API endpoint** | `/v1/chat/completions` |
| **Available groups** | **Default, SVIP**, and other common groups |
## Practical Use
### Recommended Scenarios
Grok 4.3's combo — high speed + low price + strong agent — fits well for:
1. **Production agent workflows** — high-frequency tool calls, multi-step planning, scenarios that demand stable instruction following
2. **Large-scale document processing** — 1M context + 159 t/s makes long-doc summarization and cross-file audits run fast
3. **Customer support / telecom dialogues** — 98% on τ²-Bench Telecom suggests strong performance on ticketing and tech-support tool-calling tasks
4. **Multimodal analysis** — image + text mixed input for screenshot analysis, chart reading
5. **Cost-sensitive high-QPS apps** — low unit price + fast speed makes Grok 4.3 a reasonable substitute for GPT-5.4 / Claude Sonnet in some flows
### Code Examples
#### Standard call
```python theme={null}
from openai import OpenAI
client = OpenAI(
api_key="your-apiyi-key",
base_url="https://api.apiyi.com/v1"
)
response = client.chat.completions.create(
model="grok-4.3",
messages=[
{"role": "user", "content": "Analyze this customer ticket and propose a resolution"}
],
max_tokens=4096
)
print(response.choices[0].message.content)
```
#### Multimodal call (image + text)
```python theme={null}
response = client.chat.completions.create(
model="grok-4.3",
messages=[
{
"role": "user",
"content": [
{"type": "text", "text": "What's the cause of this error in the screenshot?"},
{"type": "image_url", "image_url": {"url": "https://example.com/error.png"}}
]
}
]
)
print(response.choices[0].message.content)
```
#### Agent tool calling
```python theme={null}
tools = [
{
"type": "function",
"function": {
"name": "query_order_status",
"description": "Look up a customer order status",
"parameters": {
"type": "object",
"properties": {"order_id": {"type": "string"}},
"required": ["order_id"]
}
}
}
]
response = client.chat.completions.create(
model="grok-4.3",
messages=[{"role": "user", "content": "Check the status of order #A1024"}],
tools=tools,
tool_choice="auto"
)
```
### Best Practices
1. **Pick it for agents** — τ²-Bench / IFBench data points to a clear edge in tool calling and instruction following over generic models
2. **Mind the 200K context tier** — past 200K, input/output prices double; control prompt length on long-doc workflows
3. **Always-on reasoning is default** — reasoning tokens count against your output bill; even simple tasks incur some reasoning spend
4. **Speed-first chat** — 159 t/s throughput makes Grok 4.3 great for "stream-and-render" real-time chat UX
5. **Stack the recharge bonus** — APIYI's deposit \$100 / +10% offer effectively brings cost to \~85% of upstream
## Pricing & Availability
### Pricing (Tiered)
| Context range | Input | Output | Notes |
| ------------------- | ------------------ | ------------------ | ----------------------------------- |
| **0 – 200K tokens** | \$1.25 / 1M tokens | \$2.50 / 1M tokens | Standard tier, matches xAI upstream |
| **200K – ∞ tokens** | \$2.50 / 1M tokens | \$5.00 / 1M tokens | Long-context tier, 2x premium |
### Price comparison with recent models
| Model | Input | Output | Speed | Position |
| ----------------- | ---------- | ---------- | ----------- | --------------------------- |
| **Grok 4.3** | **\$1.25** | **\$2.50** | **159 t/s** | High-speed agent value pick |
| Grok 4.20 | \$2.00 | \$6.00 | lower | Previous flagship |
| Claude Sonnet 4.6 | \$3.00 | \$15.00 | medium | Coding generalist |
| GPT-5.5 | \$5.00 | \$30.00 | medium | Frontier reasoning |
| Gemini 3 Pro | \$2.00 | \$12.00 | higher | Multimodal |
At \$1.25 / \$2.50, Grok 4.3 has essentially no same-tier rival — comparable-performance models cost 2-10× more. Cost-performance is the headline.
### Stack with site recharge promotions
APIYI offers a deposit \$100 / +10% bonus. Stacked on listed pricing, effective cost lands around 85% of xAI's upstream rate — better the longer you use it.
### Available models & groups
| Model name | Channel | Available groups | Notes |
| ---------- | ------------------ | ------------------------------------------ | ---------------------------- |
| `grok-4.3` | xAI official relay | **Default, SVIP**, and other common groups | Latest, auto-tracks upstream |
### Access
* Site: `apiyi.com`
* API endpoint: `https://api.apiyi.com/v1`
* OpenAI SDK compatible — just swap `base_url`, `api_key`, and set `model` to `grok-4.3`
## Summary & Recommendations
Grok 4.3 is xAI's most cost-effective flagship to date: **\$1.25 / \$2.50 + 159 t/s + 1M context + strong agent skills** — a combination that has essentially no competitor in the \$1-3 input-price band.
**Worth trying / migrating to Grok 4.3 when**:
* You're already running Grok 4.20 / Claude Sonnet 4.6 / GPT-5.4 mini for agent tasks — evaluate migration first
* High-frequency tool calling, customer-support automation, telecom-style ticketing
* Cost-sensitive, high-QPS real-time chat products
* Workloads needing image input multimodal analysis
**Don't switch when**:
* You're already on GPT-5.5 / Claude Opus 4.7 for the hardest reasoning (Grok 4.3's intelligence ceiling is lower)
* You depend heavily on OpenAI/Anthropic-specific API behaviors (e.g., OpenAI's strict function schema)
* You're stable on GPT-5.4 / Gemini 3 Pro and the migration upside is marginal
APIYI has Grok 4.3 open on **Default, SVIP, and other common groups** — friendly pricing, fast speed, contained risk. After the 10% recharge bonus, effective cost is roughly 85% of xAI's upstream. Recommend a small-scale A/B on your real workloads before rolling out broadly.
Sources: xAI official API docs (docs.x.ai), Artificial Analysis independent benchmarks, VentureBeat and The Decoder coverage. Data captured: May 3, 2026 (UTC+8).