GPT-5 Pro vs Grok 4.5
At a Glance
| Compare |  GPT-5 ProOpenAI | Grok 4.5xAI |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $7.50Openrouter ↗ · Sep 3, 2026 | $2.00Xai ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $60.00Openrouter ↗ · Sep 3, 2026 | $6.00Xai ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 400K | 500K |
| Model facts checked | Sep 3, 2026View model evidence → | Sep 3, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
| Benchmark | GPT-5 Pro | Grok 4.5 |
|---|---|---|
| ARC-AGI-1verified-v1-613c385b0c93 · verified_score · leader | 70.1780% of row best · percent · GPT-5 Pro | 87.17100% of row best · percent · Grok 4.5 (Medium) |
| ARC-AGI-2verified-v2-be40992860f9 · verified_score · leader | 18.3335% of row best · percent · GPT-5 Pro | 52.64100% of row best · percent · Grok 4.5 (Medium) |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark winsNo overall winner | 2 benchmark winsNo overall winner |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | GPT-5 Pro | Grok 4.5 |
|---|---|---|
| Developer | OpenAI | xAI |
| Family | Gpt 5 | Grok 4 |
| Model | GPT-5 Pro | Grok 4.5 |
| Version | GPT-5 Pro | Grok 4.5 |
| Lifecycle | active | active |
| Released | 2025-10-06 | 2026-07-16 |
| Knowledge cutoff | 2024-09-30 | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 400K | 500K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Openai (Standard), Openrouter (Standard) | Xai (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
GPT-5 Pro Capabilities
Grok 4.5 Capabilities
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Primary Evidence
Sources and Freshness
Questions
GPT-5 Pro vs Grok 4.5 FAQs
Is GPT-5 Pro or Grok 4.5 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5 Pro and Grok 4.5, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5 Pro or Grok 4.5?+
GPT-5 Pro is $7.50 and Grok 4.5 is $2.00 per million tokens, so Grok 4.5 is cheaper on this metric. GPT-5 Pro is $60.00 and Grok 4.5 is $6.00 per million tokens, so Grok 4.5 is cheaper on this metric.
Which has a larger context window, GPT-5 Pro or Grok 4.5?+
Grok 4.5 has the larger sourced context window. GPT-5 Pro supports 400,000 tokens and Grok 4.5 supports 500,000 tokens.
Which performs better in benchmarks, GPT-5 Pro or Grok 4.5?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can GPT-5 Pro or Grok 4.5 be self-hosted?+
Both models have the same sourced self-hosting status: unsupported. GPT-5 Pro is not marked open weight; Grok 4.5 is not marked open weight.
Can GPT-5 Pro and Grok 4.5 understand images?+
GPT-5 Pro is documented with image input; Grok 4.5 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5 Pro or Grok 4.5?+
GPT-5 Pro has a sourced maximum output of 272,000 tokens; Grok 4.5's maximum output is not reported. A larger limit cannot be determined.
Do GPT-5 Pro and Grok 4.5 support reasoning and tool use?+
GPT-5 Pro: reasoning, tool calling, and image input. Grok 4.5: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5 Pro or Grok 4.5?+
GPT-5 Pro has 2 sourced provider routes; Grok 4.5 has 1, so GPT-5 Pro has broader tracked availability.
Which offers better value, GPT-5 Pro or Grok 4.5?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.