Grok 4.3
x-ai/grok-4.3Grok 4.3 is a reasoning model from SpaceXAI.
Cheap mode · 35% off ↓Cheap mode · 35% off
Fast mode prioritizes response speed. Cheap mode uses lower-cost capacity and may be a little slower. Both run Grok 4.3.
Per 1M tokens, including your 5% fee. Your selection carries into the playground and API example.
| Per 1 million tokens | Fast mode | Cheap mode | You save |
|---|---|---|---|
| Input | $1.3125 | $0.8531 | 35.0% |
| Output | $2.625 | $1.7063 | 35.0% |
All displayed prices include the 5% Free-plan fee. Standard rates are OpenRouter’s published routing ceilings; the actual standard bill may be lower. Cheapest quote: Cheaper Inference. Savings compare uncached token rates; other provider charges and your usage mix can change the total. Availability is not guaranteed.
Quote checked 11/8/2026, 8:18:05 PM UTC. This discounted route supports up to 32,768 output tokens per call.
Choose how to use Grok 4.3
Playground
Try prompts in your browser, create an agent, and see the cost of each reply. Your selected model carries into setup.
Model capabilities below describe the underlying model. Available playground features depend on its provider.
API
Connect your app with a Gizmo API key. Choose fastest or cheapest, stream text responses, and inspect timing, tokens, and charges in request logs.
A current API route is listed for this exact model. Gateway configuration is required for live calls.
Provider price + a transparent platform fee
| Rate | Provider baseline | Free plan · 5% fee | Paid plan · 4% fee |
|---|---|---|---|
| Input / 1M tokens | $1.25 | $1.3125 | $1.3 |
| Output / 1M tokens | $2.5 | $2.625 | $2.6 |
| API input / 1M tokens | $1.25 | $1.3125 | $1.3 |
| API output / 1M tokens | $2.5 | $2.625 | $2.6 |
Legacy chat image rates use the catalog baseline. The dedicated image playground shows separate estimates and settles the provider’s metered usage. API rates are current routing ceilings; final API charges use provider-reported cost plus your fee. Cheapest routing compares eligible OpenRouter and Cheaper Inference rates for the same model; savings are not guaranteed. Cached input or other provider charges may differ. Compare all model rates and verified discounts →
How your plan pays for usage
API and playground share one included allowance. Usage including the fee draws from that allowance first, then your prepaid credits. Plans bill monthly; included usage resets weekly: Free $1, Starter $5, Growth $25, Scale $50.
A $1 provider charge becomes $1.05 on Free or $1.04 on a paid plan before included usage is applied. Plan eligibility still applies in the playground.
Free models and limits
Zero-cost models stay $0, including the fee, and do not consume your dollar allowance. Free accounts can make 1,000 free-model API requests per calendar month, resetting in UTC. Admitted requests count even if the provider fails.
Free includes 20 API requests/minute and 6 playground messages/minute. Paid plans raise these limits. See plan limits.
Before a text API request, Gizmo temporarily reserves included usage and, if necessary, prepaid credit for the model’s full context plus your maximum output. Image jobs reserve twice their displayed estimate. Unused funds return after metering. This hold can exceed the final charge; unconfirmed usage remains marked pending.
Overview
Grok 4.3 is a reasoning model from SpaceXAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual accuracy. Reasoning can be configured between none/low/medium/high (default low) effort levels.
It supports a 1 million token context window with no output token limit, making it well-suited for long-document analysis, deep research, and multi-step agentic tasks. Pricing is tiered: requests exceeding 200k total tokens are billed at a higher rate.
Benchmarks
Artificial Analysis indices independent, 0–100
Design Arena head-to-head, human-voted
| Category | Elo | Win rate | Rank |
|---|---|---|---|
| pptxslides (agent) | 1071 | 32.5% | #8 |
| agentichtmlslides (agent) | 1066 | 31.8% | #9 |
| agenticslides (agent) | 1072 | 31.9% | #9 |
| agenticslides(html) (agent) | 1066 | 31.7% | #9 |
| agenticslides(python-pptx) (agent) | 1068 | 32.4% | #9 |
| htmlslides (agent) | 1011 | 28.5% | #22 |
| python-pptxslides (agent) | 1072 | 30.8% | #22 |
| Agentic game dev (agent) | 1006 | 28.7% | #24 |
Capabilities
Reasoning is on by default with effort levels high · medium · low · none (default low).
Sampling controls: temperature, top_p, max_tokens. Defaults: top_k null, top_p null, temperature null, presence_penalty null, frequency_penalty null, repetition_penalty null.
Pricing on Gizmo
These are provider baseline rates before Gizmo’s 5% Free-plan or 4% paid-plan fee. Your included usage covers charges first; overage uses prepaid credits. See the fee-inclusive comparison above.
Provider baseline rates
- Input
- $1.25 / 1M
- Cached input
- $0.2 / 1M
- Output
- $2.50 / 1M
- Web search
- $0.005 / call
Examples before the platform fee
- Typical chat turn
- $0.0037 2k in · 500 out
- $1 of input
- ≈ 800k tokens
- $1 of output
- ≈ 400k tokens
- Full context, once
- $1.25
Providers and pricing
3 ways to run Grok 4.3 on Gizmo, cheapest first. Requests follow your routing choice and fall back down this list if a provider fails.
| Provider | Route | Input / 1M | Output / 1M | Context | Uptime 24h |
|---|---|---|---|---|---|
| Cheaper InferenceLowest price | Cheaper Inference | $0.81 | $1.63 | 1M | — |
| xAI · zdr | OpenRouter | $1.25 | $2.50 | 1M | 94.9% |
| xAI | OpenRouter | $1.25 | $2.50 | 1M | 95.1% |
Rates are each provider’s, per million tokens, before Gizmo’s 5% (Free) or 4% (paid) fee. “Cheapest” routing starts at the top of this list; “Fastest” starts with the model’s maker.
More from xAI
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Run Grok 4.3 in under a minute
Create your account
Sign up with just an email. Start on the free tier with no card, or pick a paid plan for a bigger weekly allowance and $25 in bonus credits.
Your agent is ready
Grok 4.3 is preselected as the brain of your first agent. Give it a name and a system prompt, or keep the defaults.
Chat, research, create
Live web research and image generation are built in. Every reply shows what it cost, and you can switch models anytime.