GPT-5.6 Sol vs Grok 4.20 Multi Agent
Model Markets Rankings
Intelligence, Cost, and Efficiency
| Ranking | GPT-5.6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| IntelligenceHigher is better · MM Intelligence v1.2 | #4 of 2285.2 score | UnrankedNot in the 22-model eligible cohort |
| CostLower is better · Published-token output estimate | #20 of 36$0.117 per LiveBench case | UnrankedNot in the 36-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.0 | #3 of 2263.6 score | UnrankedNot in the 22-model eligible cohort |
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-5.6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| ARC-AGI-1verified-v1-15fb467fd4fc · verified_score · leader | 97.50100% of row best · percent · GPT-5.6 Sol (XHigh) | 89.5092% of row best · percent · Grok 4.20 (Reasoning) |
| ARC-AGI-2verified-v2-9a3db289984e · verified_score · leader | 92.50100% of row best · percent · GPT-5.6 Sol (Max) | 65.1470% of row best · percent · Grok 4.20 (Reasoning) |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,257.26100% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1249.79496224, 1264.72573796]; votes 29663; rank 1 | 1,204.1196% 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 · statistical tie | 1,454.69100% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1449.58093424, 1459.80348090]; votes 23153; rank 35 | 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 | 1,276.90100% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1267.71657009, 1286.08047215]; votes 5837; rank 30 | 1,259.9799% 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 | 4 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-5.6 Sol | Grok 4.20 Multi-Agent |
|---|---|---|
| Developer | OpenAI | xAI |
| Family | Gpt 5 6 | Grok 4 20 |
| Model | GPT-5.6 Sol | Grok 4.20 Multi-Agent |
| Version | GPT-5.6 Sol | Grok 4.20 Multi-Agent |
| Lifecycle | active | preview |
| Released | Unknown | Unknown |
| Knowledge cutoff | 2026-02-16 | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,050K | 1,000K |
| 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, tools | generation, reasoning, research, tools |
13 comparable fields · 8 material differences · Pair passes the primary-source comparison gate
GPT-5.6 Sol Capabilities
Grok 4.20 Multi Agent Capabilities
Internal Comparison Graph
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Primary Evidence
Sources and Freshness
Questions
GPT-5.6 Sol vs Grok 4.20 Multi Agent FAQs
Is GPT-5.6 Sol or Grok 4.20 Multi Agent better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.6 Sol 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-5.6 Sol or Grok 4.20 Multi Agent?+
GPT-5.6 Sol is $2.00 and Grok 4.20 Multi Agent is $1.25 per million tokens, so Grok 4.20 Multi Agent is cheaper on this metric. GPT-5.6 Sol is $10.00 and Grok 4.20 Multi Agent is $2.50 per million tokens, so Grok 4.20 Multi Agent is cheaper on this metric.
Which has a larger context window, GPT-5.6 Sol or Grok 4.20 Multi Agent?+
GPT-5.6 Sol has the larger sourced context window. GPT-5.6 Sol supports 1,050K and Grok 4.20 Multi Agent supports 1,000K.
Which performs better in benchmarks, GPT-5.6 Sol or Grok 4.20 Multi Agent?+
GPT-5.6 Sol 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-5.6 Sol or Grok 4.20 Multi Agent be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.6 Sol is not marked open weight; Grok 4.20 Multi Agent is not marked open weight.
Can GPT-5.6 Sol and Grok 4.20 Multi Agent understand images?+
GPT-5.6 Sol is documented with image input; Grok 4.20 Multi Agent is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.6 Sol or Grok 4.20 Multi Agent?+
Neither has a larger sourced maximum output. GPT-5.6 Sol is 128K and Grok 4.20 Multi Agent is —.
Do GPT-5.6 Sol and Grok 4.20 Multi Agent support reasoning and tool use?+
GPT-5.6 Sol: reasoning, tool calling, and image input. Grok 4.20 Multi Agent: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.6 Sol or Grok 4.20 Multi Agent?+
GPT-5.6 Sol has 2 sourced provider routes; Grok 4.20 Multi Agent has 1, so GPT-5.6 Sol has broader tracked availability.
Which offers better value, GPT-5.6 Sol 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.