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Key Takeaways

  • Live on launch week: Grok 4.5 was released on July 8, 2026 and is already available on APIYI as grok-4.5, in the default / svip groups
  • Opus-class positioning: Musk calls it “an Opus-class model, but faster, more token-efficient and lower cost”; it scores 54 on the Artificial Analysis Intelligence Index, ranking #4 (behind Claude Fable 5, Opus 4.8 and GPT-5.5) — and tops the field on agentic tool use
  • Coding and agent specialist: co-trained with Cursor (acquired by SpaceX), scoring 83.3% on Terminal Bench 2.1 — close to Fable (max) at 84.3% — and ranking #1 on the Harvey legal-agent evaluation
  • Standout token efficiency: averages 15,954 output tokens on SWE Bench Pro, roughly 1/4.2 of Opus 4.8 (max), resolving tasks in about half the steps — which compounds into lower real-world cost
  • Sharp pricing: $2.00 per million input tokens and $6.00 per million output tokens — about half the price of comparable flagships

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Background

On July 8, 2026, SpaceXAI (the brand xAI operates under after folding into SpaceX) released Grok 4.5, billing it as its “smartest model yet” for coding, agentic tasks, and knowledge work. Two signals stand out. First, the training approach: Grok 4.5 was co-trained with the AI coding tool Cursor, with reinforcement learning spanning hundreds of thousands of real tasks on tens of thousands of NVIDIA GB300 GPUs. Second, the pricing strategy: while it trails Claude Fable 5 on benchmarks, it undercuts comparable flagships by roughly half — a move industry observers widely read as price pressure on Anthropic and OpenAI. Note that Grok 4.5 is not yet available in the EU on the official platform (expected mid-July); calling it through the APIYI gateway is not subject to that regional restriction.

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Deep Dive

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Benchmarks (data retrieved 2026/7/10)

BenchmarkGrok 4.5Reference (Fable max)
Artificial Analysis Intelligence Index54 (rank #4)—
DeepSWE 1.0 (pass@1)62.0%66.1%
Terminal Bench 2.183.3%84.3%
SWE Bench Pro64.7%80.4%
Harvey Legal AgentRank #1—
Agentic tool useRank #1—
Benchmark sources: the official SpaceXAI announcement at x.ai/news/grok-4-5, artificialanalysis.ai/models/grok-4-5, and marktechpost.com (July 8, 2026).

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Core Features

Agentic & Coding Strength

Co-trained with Cursor, tops agentic tool use, and resolves tasks in roughly half the steps of comparable models — well suited to coding agents and terminal automation

Token Efficiency

Averages 15,954 output tokens on SWE Bench Pro versus 67,020 for Opus 4.8 (max) — about 4.2x fewer, so the same task costs less end to end

Long Context

500K context window (portions beyond 200K are billed at official higher-context rates), with text + image input

Speed

Measured output around 80-90 tokens/s, above the class average of roughly 76 tokens/s

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Practical Use

  • Coding agents / IDE integration: trained on the same data lineage as Cursor, with standout tool-calling and terminal-task performance
  • High-volume agent pipelines: high token efficiency and fewer steps mean the cost advantage compounds over long chains
  • Knowledge work: field-tested #1 result on the Harvey legal-agent evaluation

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Code Example

import openai

client = openai.OpenAI(
    api_key="your-apiyi-key",
    base_url="https://api.apiyi.com/v1"
)

response = client.chat.completions.create(
    model="grok-4.5",
    messages=[
        {"role": "user", "content": "Write a binary search in Python and explain the boundary conditions"}
    ]
)
print(response.choices[0].message.content)
It speaks the OpenAI-compatible format — existing code only needs the model field changed to grok-4.5.

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Pricing & Availability

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Pricing

ItemOfficial APIAPIYI
Input$2.00 / 1M tokens$2.00 / 1M tokens (official parity)
Output$6.00 / 1M tokens$6.00 / 1M tokens (official parity)
Cached input$0.50 / 1M tokensDiscounted automatically on cache hits
Official terms: requests beyond 200K tokens are billed at higher long-context rates; the EU is not yet served on the official platform (expected mid-July), while the APIYI channel has no regional restriction.

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Stack It with Recharge Bonuses

APIYI recharge bonuses stack on top, bringing the effective price below official direct billing — see the recharge promotions guide.

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Summary & Recommendations

Grok 4.5’s positioning is crisp: rather than chasing the top benchmark spot, it claims the high-volume agent and coding segment with “Opus-class capability at half the price and 4x the token efficiency.” If your main workload is coding agents, tool-call-heavy automation, or cost-sensitive long pipelines, Grok 4.5 belongs on your shortlist; for frontier reasoning and complex research, Claude Fable 5 and GPT-5.5 still set the ceiling.
Sources: the official SpaceXAI announcement at x.ai/news/grok-4-5, TechCrunch, Artificial Analysis, MarkTechPost; data retrieved July 10, 2026. The model is live on APIYI — grab a key and start calling.