GPT-5.5 vs Grok Build 0.1
Benchmark Performance
Available Benchmarks
| Benchmark | GPT-5.5 | Grok Build 0.1 |
|---|---|---|
| LMArena Agent Arenaagent-2026-08-31-011508720696 · outcome_score · leader | 4.84100% of row best · score · GPT 5.5; 95% CI [3.96340788, 5.71819765]; sessions 77762; observations 1908513; rank 18 | -11.3185% of row best · score · Grok Build 0.1; 95% CI [-12.50212956, -10.11963476]; sessions 74459; observations 5587414; rank 53 |
| LiveBench2026-06-25 · overall · leader | 84.54100% of row best · percent · gpt-5.5-xhigh · 11,355 output tokens / case | 71.0984% of row best · percent · grok-build-0.1 · 980 output tokens / case |
| 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 | Grok Build 0.1 |
|---|---|---|
| Developer | Openai | Xai |
| Family | Gpt 5 5 | Grok Build |
| Model | GPT-5.5 | Grok Build 0.1 |
| Version | GPT-5.5 | Grok Build 0.1 |
| Lifecycle | active | preview |
| Released | 2026-04-23 | 2026-05-29 |
| Knowledge cutoff | 2025-12-01 | Unknown |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| Context window | 1,050,000 | 256,000 |
| 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 |
12 comparable fields · 8 material differences · Interactive comparison only; indexing gate not met
GPT-5.5 Capabilities
Grok Build 0.1 Capabilities
Primary Evidence
Sources and Freshness
Questions
GPT-5.5 vs Grok Build 0.1 FAQs
Is GPT-5.5 or Grok Build 0.1 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.5 and Grok Build 0.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.5 or Grok Build 0.1?+
Only GPT-5.5 has a directly sourced input price: $5.00 per million tokens. Only GPT-5.5 has a directly sourced output price: $30.00 per million tokens.
Which has a larger context window, GPT-5.5 or Grok Build 0.1?+
GPT-5.5 has the larger sourced context window. GPT-5.5 supports 1,050,000 and Grok Build 0.1 supports 256,000.
Which performs better in benchmarks, GPT-5.5 or Grok Build 0.1?+
GPT-5.5 leads the current overall benchmark count. The result uses 2 protocol-matched benchmarks from 2 publishers; it is not a universal quality score.
Can GPT-5.5 or Grok Build 0.1 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.5 is not marked open weight; Grok Build 0.1 is not marked open weight.
Can GPT-5.5 and Grok Build 0.1 understand images?+
GPT-5.5 is not documented with image input; Grok Build 0.1 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.5 or Grok Build 0.1?+
Neither has a larger sourced maximum output. GPT-5.5 is 128,000 and Grok Build 0.1 is —.
Do GPT-5.5 and Grok Build 0.1 support reasoning and tool use?+
GPT-5.5: reasoning and tool calling. Grok Build 0.1: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.5 or Grok Build 0.1?+
GPT-5.5 has 2 sourced provider routes; Grok Build 0.1 has 1, so GPT-5.5 has broader tracked availability.
Which offers better value, GPT-5.5 or Grok Build 0.1?+
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.