GPT-5.6 Sol vs Grok 4.5
Model Markets Rankings
Intelligence, Cost, and Efficiency
| Ranking | GPT-5.6 Sol | Grok 4.5 |
|---|---|---|
| CostLower is better · Published-token output estimate | #20 of 36$0.117 per LiveBench case | #14 of 36$0.063 per LiveBench case |
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 4.5 |
|---|---|---|
| ARC-AGI-1verified-v1-2aa739d957fc · verified_score · leader | 97.50100% of row best · percent · GPT-5.6 Sol (XHigh) | 87.1789% of row best · percent · Grok 4.5 (Medium) |
| ARC-AGI-2verified-v2-b5cb5ec6e8c7 · verified_score · leader | 92.50100% of row best · percent · GPT-5.6 Sol (Max) | 52.6457% of row best · percent · Grok 4.5 (Medium) |
| LMArena Agent Arenaagent-2026-08-31-011508720696 · outcome_score · leader | 9.76100% of row best · score · GPT 5.6 Sol (xHigh); 95% CI [8.23209281, 11.28769899]; sessions 28524; observations 2917301; rank 4 | 6.0697% of row best · score · Grok 4.5; 95% CI [4.91016619, 7.21148996]; sessions 34008; observations 1655564; rank 13 |
| LMArena Document Arenadocument-2026-07-30-011508720696 · arena_rating · statistical tie | 1,478.68100% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1461.94144922, 1495.42273628]; votes 1152; rank 11 | 1,453.7398% of row best · rating · grok-4.5; 95% CI [1441.93744334, 1465.52785378]; votes 2435; rank 20 |
| 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 | 1,212.6596% of row best · rating · grok-4.5; 95% CI [1205.78347274, 1219.50889748]; votes 31505; rank 8 |
| 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 | 1,451.82100% of row best · rating · grok-4.5; 95% CI [1446.90989155, 1456.73122428]; votes 25873; rank 39 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · statistical tie | 1,276.9099% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1267.71657009, 1286.08047215]; votes 5837; rank 30 | 1,291.11100% of row best · rating · grok-4.5; 95% CI [1282.25469345, 1299.96666150]; votes 6401; rank 22 |
| LiveBench2026-06-25 · overall · leader | 85.26100% of row best · percent · gpt-5.6-sol-max · 11,729 output tokens / case | 80.0194% of row best · percent · grok-4.5 · 10,517 output tokens / case |
| ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader | 87.35100% of row best · points · GPT-5.6 Sol (default) · 2,955 output tokens / case | 82.2394% of row best · points · Grok 4.5 · 2,688 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 3 ties | 6 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 4.5 |
|---|---|---|
| Developer | OpenAI | xAI |
| Family | Gpt 5 6 | Grok 4 |
| Model | GPT-5.6 Sol | Grok 4.5 |
| Version | GPT-5.6 Sol | Grok 4.5 |
| Lifecycle | active | active |
| Released | Unknown | 2026-07-16 |
| Knowledge cutoff | 2026-02-16 | Unknown |
| 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, tools | chat, generation, reasoning, structured_outputs, tools |
13 comparable fields · 7 material differences · Pair passes the primary-source comparison gate
GPT-5.6 Sol Capabilities
Grok 4.5 Capabilities
Internal Comparison Graph
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Primary Evidence
Sources and Freshness
Questions
GPT-5.6 Sol vs Grok 4.5 FAQs
Is GPT-5.6 Sol or Grok 4.5 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.6 Sol and Grok 4.5, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.6 Sol or Grok 4.5?+
GPT-5.6 Sol is $2.00 and Grok 4.5 is $2.00 per million tokens, so they are tied on this metric. GPT-5.6 Sol is $10.00 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-5.6 Sol or Grok 4.5?+
GPT-5.6 Sol has the larger sourced context window. GPT-5.6 Sol supports 1,050K and Grok 4.5 supports 500K.
Which performs better in benchmarks, GPT-5.6 Sol or Grok 4.5?+
GPT-5.6 Sol leads the current overall benchmark count. The result uses 9 protocol-matched benchmarks from 4 publishers; it is not a universal quality score.
Can GPT-5.6 Sol or Grok 4.5 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.6 Sol is not marked open weight; Grok 4.5 is not marked open weight.
Can GPT-5.6 Sol and Grok 4.5 understand images?+
GPT-5.6 Sol 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-5.6 Sol or Grok 4.5?+
Neither has a larger sourced maximum output. GPT-5.6 Sol is 128K and Grok 4.5 is —.
Do GPT-5.6 Sol and Grok 4.5 support reasoning and tool use?+
GPT-5.6 Sol: 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-5.6 Sol or Grok 4.5?+
GPT-5.6 Sol has 2 sourced provider routes; Grok 4.5 has 1, so GPT-5.6 Sol has broader tracked availability.
Which offers better value, GPT-5.6 Sol 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.