GPT-5.1 vs Grok 4.20 Multi-Agent
Benchmark Performance
Available Benchmarks
| Benchmark | GPT-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| ARC-AGI-1verified-v1-15fb467fd4fc · verified_score · leader | 72.8381% of row best · percent · GPT-5.1 (Thinking, High) | 89.50100% of row best · percent · Grok 4.20 (Reasoning) |
| ARC-AGI-2verified-v2-9a3db289984e · verified_score · leader | 17.6427% of row best · percent · GPT-5.1 (Thinking, High) | 65.14100% of row best · percent · Grok 4.20 (Reasoning) |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · statistical tie | 1,199.44100% of row best · rating · gpt-5.1-search; 95% CI [1194.20592738, 1204.68165473]; votes 59909; rank 14 | 1,204.11100% of row best · rating · grok-4.20-multi-agent-beta-0309; 95% CI [1198.80874858, 1209.41102574]; votes 109553; rank 13 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,422.4798% of row best · rating · gpt-5.1; 95% CI [1418.85253526, 1426.08681113]; votes 43002; rank 96 | 1,450.22100% of row best · rating · grok-4.20-multi-agent-beta-0309; 95% CI [1446.44654530, 1453.99996127]; votes 60845; rank 43 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · leader | 1,235.1998% of row best · rating · gpt-5.1; 95% CI [1227.44529223, 1242.93837299]; votes 10223; rank 60 | 1,259.97100% of row best · rating · grok-4.20-multi-agent-beta-0309; 95% CI [1253.56879963, 1266.36768970]; votes 22988; rank 42 |
| Overall ResultCounted from the protocol-matched rows above · 1 tie | 0 benchmark wins | 4 benchmark winsOverall lead |
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-5.1 | Grok 4.20 Multi-Agent |
|---|---|---|
| Developer | Openai | Xai |
| Family | Gpt 5 1 | Grok 4 20 |
| Model | GPT-5.1 | Grok 4.20 Multi-Agent |
| Version | GPT-5.1 | Grok 4.20 Multi-Agent |
| Lifecycle | active | preview |
| Released | 2025-11-13 | Unknown |
| Knowledge cutoff | 2024-09-30 | Unknown |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| Context window | 400,000 | 1,000,000 |
| 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 | generation, reasoning, research, tools |
11 comparable fields · 8 material differences · Interactive comparison only; indexing gate not met
GPT-5.1 Capabilities
Grok 4.20 Multi-Agent Capabilities
Primary Evidence
Sources and Freshness
Questions
GPT-5.1 vs Grok 4.20 Multi-Agent FAQs
Is GPT-5.1 or Grok 4.20 Multi-Agent better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.1 and Grok 4.20 Multi-Agent, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.1 or Grok 4.20 Multi-Agent?+
Only GPT-5.1 has a directly sourced input price: $1.25 per million tokens. Only GPT-5.1 has a directly sourced output price: $10.00 per million tokens.
Which has a larger context window, GPT-5.1 or Grok 4.20 Multi-Agent?+
Grok 4.20 Multi-Agent has the larger sourced context window. GPT-5.1 supports 400,000 and Grok 4.20 Multi-Agent supports 1,000,000.
Which performs better in benchmarks, GPT-5.1 or Grok 4.20 Multi-Agent?+
Grok 4.20 Multi-Agent leads the current overall benchmark count. The result uses 5 protocol-matched benchmarks from 2 publishers; it is not a universal quality score.
Can GPT-5.1 or Grok 4.20 Multi-Agent be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.1 is not marked open weight; Grok 4.20 Multi-Agent is not marked open weight.
Can GPT-5.1 and Grok 4.20 Multi-Agent understand images?+
GPT-5.1 is not documented with image input; Grok 4.20 Multi-Agent is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.1 or Grok 4.20 Multi-Agent?+
Neither has a larger sourced maximum output. GPT-5.1 is 128,000 and Grok 4.20 Multi-Agent is —.
Do GPT-5.1 and Grok 4.20 Multi-Agent support reasoning and tool use?+
GPT-5.1: reasoning and tool calling. Grok 4.20 Multi-Agent: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.1 or Grok 4.20 Multi-Agent?+
GPT-5.1 has 2 sourced provider routes; Grok 4.20 Multi-Agent has 1, so GPT-5.1 has broader tracked availability.
Which offers better value, GPT-5.1 or Grok 4.20 Multi-Agent?+
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.