GPT-5.5 vs GPT-5.6 Sol
Benchmark Performance
Available Benchmarks
| Benchmark | GPT-5.5 | GPT-5.6 Sol |
|---|---|---|
| ARC-AGI-1verified-v1-15fb467fd4fc · verified_score · leader | 95.0097% of row best · percent · GPT-5.5 (XHigh) | 97.50100% of row best · percent · GPT-5.6 Sol (XHigh) |
| ARC-AGI-2verified-v2-9a3db289984e · verified_score · leader | 85.0092% of row best · percent · GPT-5.5 (XHigh) | 92.50100% of row best · percent · GPT-5.6 Sol (Max) |
| LMArena Agent Arenaagent-2026-08-31-011508720696 · outcome_score · leader | 4.8496% of row best · score · GPT 5.5; 95% CI [3.96340788, 5.71819765]; sessions 77762; observations 1908513; rank 18 | 9.76100% of row best · score · GPT 5.6 Sol (xHigh); 95% CI [8.23209281, 11.28769899]; sessions 28524; observations 2917301; rank 4 |
| LMArena Document Arenadocument-2026-07-30-011508720696 · arena_rating · statistical tie | 1,480.30100% of row best · rating · gpt-5.5; 95% CI [1473.46488383, 1487.13183487]; votes 17286; rank 9 | 1,478.68100% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1461.94144922, 1495.42273628]; votes 1152; rank 11 |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,242.0599% of row best · rating · gpt-5.5-search; 95% CI [1236.73488085, 1247.37053078]; votes 89873; rank 3 | 1,257.26100% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1249.79496224, 1264.72573796]; votes 29663; rank 1 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,466.80100% of row best · rating · gpt-5.5; 95% CI [1462.99653821, 1470.60035247]; votes 64686; rank 27 | 1,454.6999% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1449.58093424, 1459.80348090]; votes 23153; rank 35 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · leader | 1,294.36100% of row best · rating · gpt-5.5-high; 95% CI [1287.65516407, 1301.05910249]; votes 20121; rank 18 | 1,276.9099% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1267.71657009, 1286.08047215]; votes 5837; rank 30 |
| LiveBench2026-06-25 · overall · leader | 84.5499% of row best · percent · gpt-5.5-xhigh · 11,355 output tokens / case | 85.26100% of row best · percent · gpt-5.6-sol-max · 11,729 output tokens / case |
| ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader | 81.5393% of row best · points · GPT-5.5 (none) · 3,805 output tokens / case | 87.35100% of row best · points · GPT-5.6 Sol (default) · 2,955 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 1 tie | 2 benchmark wins | 6 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-5.5 | GPT-5.6 Sol |
|---|---|---|
| Developer | Openai | Openai |
| Family | Gpt 5 5 | Gpt 5 6 |
| Model | GPT-5.5 | GPT-5.6 Sol |
| Version | GPT-5.5 | GPT-5.6 Sol |
| Lifecycle | active | active |
| Released | 2026-04-23 | Unknown |
| Knowledge cutoff | 2025-12-01 | 2026-02-16 |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| Context window | 1,050,000 | 1,050,000 |
| 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) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, tools |
12 comparable fields · 5 material differences · Interactive comparison only; indexing gate not met
GPT-5.5 Capabilities
GPT-5.6 Sol Capabilities
Primary Evidence
Sources and Freshness
Questions
GPT-5.5 vs GPT-5.6 Sol FAQs
Is GPT-5.5 or GPT-5.6 Sol better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.5 and GPT-5.6 Sol, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.5 or GPT-5.6 Sol?+
GPT-5.5 is $5.00 and GPT-5.6 Sol is $2.00 per million tokens, so GPT-5.6 Sol is cheaper on this metric. GPT-5.5 is $30.00 and GPT-5.6 Sol is $10.00 per million tokens, so GPT-5.6 Sol is cheaper on this metric.
Which has a larger context window, GPT-5.5 or GPT-5.6 Sol?+
Neither model has a larger sourced context window in this comparison. GPT-5.5 is 1,050,000 and GPT-5.6 Sol is 1,050,000.
Which performs better in benchmarks, GPT-5.5 or GPT-5.6 Sol?+
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-5.5 or GPT-5.6 Sol be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.5 is not marked open weight; GPT-5.6 Sol is not marked open weight.
Can GPT-5.5 and GPT-5.6 Sol understand images?+
GPT-5.5 is not documented with image input; GPT-5.6 Sol is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.5 or GPT-5.6 Sol?+
Neither has a larger sourced maximum output. GPT-5.5 is 128,000 and GPT-5.6 Sol is 128,000.
Do GPT-5.5 and GPT-5.6 Sol support reasoning and tool use?+
GPT-5.5: reasoning and tool calling. GPT-5.6 Sol: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.5 or GPT-5.6 Sol?+
GPT-5.5 has 2 sourced provider routes; GPT-5.6 Sol has 2, a tie.
Which offers better value, GPT-5.5 or GPT-5.6 Sol?+
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.