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SpaceXAI: Grok 4.3

x-ai/grok-4.3

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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.

Modalities
In / Out Price
$1.25 / $2.50per 1M
Context
1.0M
Released
Apr 30, 2026
Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), Floor (cheapest), or Exacto (highest tool-calling accuracy).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for SpaceXAI: Grok 4.3 (Artificial Analysis and Design Arena)
SourceBenchmarkScore
Artificial AnalysisGrok 4.3 (Non-reasoning) Intelligence Index14.0
Artificial AnalysisGrok 4.3 (Non-reasoning) Coding Index35.2
Artificial AnalysisGrok 4.3 (Non-reasoning) Agentic Index14.0
Artificial AnalysisGrok 4.3 (Non-reasoning) GPQA Diamond65.8%
Artificial AnalysisGrok 4.3 (Non-reasoning) HLE6.8%
Artificial AnalysisGrok 4.3 (Non-reasoning) IFBench47.6%
Artificial AnalysisGrok 4.3 (Non-reasoning) τ²-Bench Telecom65.8%
Artificial AnalysisGrok 4.3 (Non-reasoning) AA-LCR32.3%
Artificial AnalysisGrok 4.3 (Non-reasoning) GDPval-AA21.5%
Artificial AnalysisGrok 4.3 (Non-reasoning) CritPt0.0%
Artificial AnalysisGrok 4.3 (Non-reasoning) SciCode39.4%
Artificial AnalysisGrok 4.3 (Non-reasoning) Terminal-Bench Hard18.9%
Artificial AnalysisGrok 4.3 (Non-reasoning) AA-Omniscience Accuracy23.7%
Artificial AnalysisGrok 4.3 (Non-reasoning) AA-Omniscience Non-Hallucination Rate25.5%
Artificial AnalysisGrok 4.3 (medium) GPQA Diamond89.0%
Artificial AnalysisGrok 4.3 (medium) HLE30.0%
Artificial AnalysisGrok 4.3 (medium) IFBench83.3%
Artificial AnalysisGrok 4.3 (medium) τ²-Bench Telecom91.2%
Artificial AnalysisGrok 4.3 (medium) AA-LCR75.0%
Artificial AnalysisGrok 4.3 (medium) CritPt4.9%
Artificial AnalysisGrok 4.3 (medium) Terminal-Bench Hard30.3%
Artificial AnalysisGrok 4.3 (medium) AA-Omniscience Accuracy28.8%
Artificial AnalysisGrok 4.3 (medium) AA-Omniscience Non-Hallucination Rate83.1%
Artificial AnalysisGrok 4.3 (high) Intelligence Index24.9
Artificial AnalysisGrok 4.3 (high) Coding Index42.2
Artificial AnalysisGrok 4.3 (high) Agentic Index15.5
Artificial AnalysisGrok 4.3 (high) GPQA Diamond90.1%
Artificial AnalysisGrok 4.3 (high) HLE37.2%
Artificial AnalysisGrok 4.3 (high) IFBench81.3%
Artificial AnalysisGrok 4.3 (high) τ²-Bench Telecom97.7%
Artificial AnalysisGrok 4.3 (high) AA-LCR73.0%
Artificial AnalysisGrok 4.3 (high) GDPval-AA21.2%
Artificial AnalysisGrok 4.3 (high) CritPt8.0%
Artificial AnalysisGrok 4.3 (high) SciCode48.3%
Artificial AnalysisGrok 4.3 (high) Terminal-Bench Hard37.9%
Artificial AnalysisGrok 4.3 (high) AA-Omniscience Accuracy34.8%
Artificial AnalysisGrok 4.3 (high) AA-Omniscience Non-Hallucination Rate74.2%
Artificial AnalysisGrok 4.3 (low) GPQA Diamond84.3%
Artificial AnalysisGrok 4.3 (low) HLE18.4%
Artificial AnalysisGrok 4.3 (low) IFBench81.0%
Artificial AnalysisGrok 4.3 (low) τ²-Bench Telecom88.9%
Artificial AnalysisGrok 4.3 (low) AA-LCR74.0%
Artificial AnalysisGrok 4.3 (low) CritPt0.6%
Artificial AnalysisGrok 4.3 (low) Terminal-Bench Hard26.5%
Artificial AnalysisGrok 4.3 (low) AA-Omniscience Accuracy26.7%
Artificial AnalysisGrok 4.3 (low) AA-Omniscience Non-Hallucination Rate82.6%
Design ArenaGrok 4.3 Agents Arena Agenticgamedev Elo1009
Design ArenaGrok 4.3 Agents Arena Agentichtmlslides Elo1066
Design ArenaGrok 4.3 Agents Arena Agenticslides Elo1072
Design ArenaGrok 4.3 Agents Arena Agenticslides(Html) Elo1066
Design ArenaGrok 4.3 Agents Arena Agenticslides(Python-Pptx) Elo1068
Design ArenaGrok 4.3 Agents Arena Androidnative Elo978
Design ArenaGrok 4.3 Agents Arena Full Stack Elo1015
Design ArenaGrok 4.3 Agents Arena Godotgamedev Elo923
Design ArenaGrok 4.3 Agents Arena Htmlslides Elo1011
Design ArenaGrok 4.3 Agents Arena Mobile Apps Elo1060
Design ArenaGrok 4.3 Agents Arena Pptxslides Elo1071
Design ArenaGrok 4.3 Agents Arena Python-Pptxslides Elo1072
Design ArenaGrok 4.3 Agents Arena Python-Pptxslides Elo1018
Design ArenaGrok 4.3 Agents Arena Webapps Elo1138
Design ArenaGrok 4.3 Models Arena 3D Elo1143
Design ArenaGrok 4.3 Models Arena Asciiart Elo1145
Design ArenaGrok 4.3 Models Arena Code Categories Elo1196
Design ArenaGrok 4.3 Models Arena Data Visualization Elo1190
Design ArenaGrok 4.3 Models Arena Game Development Elo1188
Design ArenaGrok 4.3 Models Arena SVG Elo1081
Design ArenaGrok 4.3 Models Arena UI Component Elo1203
Design ArenaGrok 4.3 Models Arena Website Elo1203

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

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Availability over the last 3 days

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Availability over the last 24 hours

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When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

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Frequently asked questions

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.

Grok 4.3 costs $1.25/M input tokens and $2.50/M output tokens, with separate rates for Cache Read at $0.20/M tokens and Web Search at $5.00/1K calls.

Grok 4.3 has a 1,000,000 token context window.

Yes. Grok 4.3 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Grok 4.3 accepts text, images, and files such as PDFs as input and returns text.

Grok 4.7, Grok 4.6, Grok 4.5 and 3 more are other text models from SpaceXAI.

Grok 4.3 was released on April 30, 2026.

More models from SpaceXAI

Grok 4.7

Grok 4.7 is SpaceXAI's flagship model for coding, agentic tasks, and knowledge work, succeeding Grok 4.6. It is particularly strong at long-running software engineering tasks, verifying its own work, and managing long context, and it improves on its predecessor at professional knowledge work such as drafting documents and presentations.

The model was trained with a longer reinforcement learning run weighted toward problems that take many hours to complete, and natively understands the Grok Bot harness for conversational tasks. It ships with a new safeguard stack that pairs strong jailbreak resistance with low refusal rates for legitimate cybersecurity and biology work. SpaceXAI's reported benchmark results use the xhigh reasoning effort.

Text500K context$2 / $6
Grok 4.6

Grok 4.6 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM. It is succeeded by Grok 4.7.

Text500K context$2 / $6
Grok Imagine Image 2.0

Grok Imagine Image 2.0 is an image generation and editing model from xAI. It is suited for creating images from text prompts and editing images from references, with low and medium quality modes.

Imagefrom $0.04/image
Grok STT 1.0

Grok STT is SpaceXAI's speech-to-text model, available via the REST /v1/stt endpoint. It supports transcription with word-level timestamps, optional speaker diarization, and multichannel audio.

Transcription$0.000028/second
Grok Imagine Video 1.5

Grok Imagine Video 1.5 is a video generation model from SpaceXAI. It creates videos from text prompts, with an optional starting image to guide the scene. It can direct subject and camera motion, pacing, atmosphere, and physical behavior while maintaining visual continuity, and can generate synchronized sound effects, ambience, and dialogue.

Videofrom $0.08/second
Grok 4.5

Grok 4.5 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.

Text500K context$2 / $6
Grok Latest

This model always redirects to the latest Grok model from xAI.

Text500K context
Grok Build 0.1

Grok Build 0.1 is SpaceXAI’s fast coding model trained specifically for agentic software engineering workflows. It supports text and image inputs with text output, and is optimized for interactive coding agents, tool use, and multi-step development tasks. The model powers SpaceXAI’s Grok Build CLI and features a 256K context window with no text output limit, making it well suited for long-horizon coding and automation workflows. Currently in early access.

Text256K context$1 / $2
Grok Imagine Video

Grok Imagine Video is SpaceXAI's fast, text-, image-, and reference-conditioned video generation model. It produces short videos (1–15 seconds, 24 fps) at 480p or 720p across seven aspect ratios - 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, and 2:3.

The model supports three generation modes: text-to-video from a prompt alone, image-to-video that animates a still input, and reference-to-video that grounds the output in up to seven reference images for consistent characters, styles, or settings.

Videofrom $0.05/second
Grok Imagine Image Quality

Grok Imagine Image Quality is SpaceXAI's fast, high-fidelity image generation and editing model. It accepts text prompts and optional reference images, producing photorealistic outputs at 1K or 2K across a range of aspect ratios, including flexible adjustment of reference images.

The model emphasizes realistic detail — natural lighting and physics, accurate textures, and consistent rendering of named entities such as brands, public figures, and specific locations. It supports clean multilingual text rendering inside images, making it the top choice for posters, packaging, ads, menus, and social graphics. When given reference images, it preserves identity and structure for product placement, brand-aligned variations, and character continuity across scenes.

Imagefrom $0.05/image
Grok Voice TTS 1.0

Grok Voice TTS 1.0 is a text-to-speech model from SpaceXAI. It converts text into spoken audio across 20+ languages with automatic language detection, and offers five built-in voices (Eve, Ara, Rex, Sal, Leo) covering a range of tones. Inline speech tags allow control over pauses, emphasis, pitch, speed, and vocal style. Output is available in MP3, WAV, PCM, μ-law, and A-law formats at sample rates from 8 kHz to 48 kHz, with up to 15,000 characters per request.

Speech$15/M characters
Grok 4.3

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.

Text1M context$1 / $2
Grok 4.20 Multi-Agent

Grok 4.20 Multi-Agent is a variant of SpaceXAI’s Grok 4.20 designed for collaborative, agent-based workflows. Multiple agents operate in parallel to conduct deep research, coordinate tool use, and synthesize information across complex tasks.

Reasoning effort behavior:

Text2M context$1.25 / $2.50
Grok 4.20

Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses.

Reasoning can be enabled/disabled using the reasoning enabled parameter in the API. Learn more in our docs

Text2M context$1.25 / $2.50
Grok 4.20 Multi-Agent Beta

Grok 4.20 Multi-Agent Beta is a variant of xAI’s Grok 4.20 designed for collaborative, agent-based workflows. Multiple agents operate in parallel to conduct deep research, coordinate tool use, and synthesize information across complex tasks.

Reasoning effort behavior:

Text2M context
Grok 4.20 Beta

Grok 4.20 Beta is xAI's newest flagship model with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses.

Reasoning can be enabled/disabled using the reasoning enabled parameter in the API. Learn more in our docs

Text2M context
Grok 4.1 Fast

Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window.

Reasoning can be enabled/disabled using the reasoning enabled parameter in the API. Learn more in our docs

Text2M context
Grok 4 Fast

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model on xAI's news post.

Reasoning can be enabled/disabled using the reasoning enabled parameter in the API. Learn more in our docs

Text2M context
Grok Code Fast 1

Grok Code Fast 1 is a speedy and economical reasoning model that excels at agentic coding. With reasoning traces visible in the response, developers can steer Grok Code for high-quality work flows.

Text256K context
Grok 4

Grok 4 is xAI's latest reasoning model with a 256k context window. It supports parallel tool calling, structured outputs, and both image and text inputs. Note that reasoning is not exposed, reasoning cannot be disabled, and the reasoning effort cannot be specified. Pricing increases once the total tokens in a given request is greater than 128k tokens. See more details on the xAI docs

Text256K context