GPT-5.5 Pro vs Grok 4.6
Model Markets Rankings
Intelligence, Cost, and Efficiency
| Ranking | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| IntelligenceHigher is better · MM Intelligence v1.2 | UnrankedNot in the 22-model eligible cohort | #13 of 2267.6 score |
| CostLower is better · Published-token output estimate | UnrankedNot in the 36-model eligible cohort | #18 of 36$0.097 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.0 | UnrankedNot in the 22-model eligible cohort | #8 of 2256.6 score |
Ranks come from the current complete eligible cohorts. Green highlights appear only when both models are ranked in the same metric. Missing required inputs remain unranked, and the three dimensions are not collapsed into an overall winner.
Benchmark Performance
Available Benchmarks
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| ARC-AGI-1verified-v1-2aa739d957fc · verified_score · leader | 96.50100% of row best · percent · GPT-5.5 Pro (High) | 87.5091% of row best · percent · Grok 4.6 (Medium) |
| ARC-AGI-2verified-v2-b5cb5ec6e8c7 · verified_score · leader | 84.58100% of row best · percent · GPT-5.5 Pro (High) | 67.0879% of row best · percent · Grok 4.6 (XHigh) |
| Overall ResultCounted from the protocol-matched rows above | 2 benchmark winsOverall lead | 0 benchmark wins |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| Developer | OpenAI | xAI |
| Family | Gpt 5 5 | Grok 4 |
| Model | GPT-5.5 Pro | Grok 4.6 |
| Version | GPT-5.5 Pro | Grok 4.6 |
| Lifecycle | active | active |
| Released | 2026-04-23 | Unknown |
| Knowledge cutoff | 2025-12-01 | 2026-02-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,050K | 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, tools |
14 comparable fields · 8 material differences · Pair passes the primary-source comparison gate
GPT-5.5 Pro Capabilities
Grok 4.6 Capabilities
Internal Comparison Graph
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Primary Evidence
Sources and Freshness
Questions
GPT-5.5 Pro vs Grok 4.6 FAQs
Is GPT-5.5 Pro or Grok 4.6 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.5 Pro and Grok 4.6, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.5 Pro or Grok 4.6?+
GPT-5.5 Pro is $30.00 and Grok 4.6 is $2.00 per million tokens, so Grok 4.6 is cheaper on this metric. GPT-5.5 Pro is $180.00 and Grok 4.6 is $6.00 per million tokens, so Grok 4.6 is cheaper on this metric.
Which has a larger context window, GPT-5.5 Pro or Grok 4.6?+
GPT-5.5 Pro has the larger sourced context window. GPT-5.5 Pro supports 1,050K and Grok 4.6 supports 500K.
Which performs better in benchmarks, GPT-5.5 Pro or Grok 4.6?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can GPT-5.5 Pro or Grok 4.6 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.5 Pro is not marked open weight; Grok 4.6 is not marked open weight.
Can GPT-5.5 Pro and Grok 4.6 understand images?+
GPT-5.5 Pro is documented with image input; Grok 4.6 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.5 Pro or Grok 4.6?+
Neither has a larger sourced maximum output. GPT-5.5 Pro is 128K and Grok 4.6 is —.
Do GPT-5.5 Pro and Grok 4.6 support reasoning and tool use?+
GPT-5.5 Pro: reasoning, tool calling, and image input. Grok 4.6: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.5 Pro or Grok 4.6?+
GPT-5.5 Pro has 2 sourced provider routes; Grok 4.6 has 1, so GPT-5.5 Pro has broader tracked availability.
Which offers better value, GPT-5.5 Pro or Grok 4.6?+
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.