GPT-5.5 vs GPT-5.6 Sol
At a Glance
| Compare |  GPT-5.5OpenAI | GPT-5.6 SolOpenAI |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $5.00Openai ↗ · Sep 3, 2026 | $4.00Openai ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $30.00Openai ↗ · Sep 3, 2026 | $20.00Openai ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 1,050K | 1,050K |
| Model facts checked | Sep 3, 2026View model evidence → | Aug 28, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
| Benchmark | GPT-5.5 | GPT-5.6 Sol |
|---|---|---|
| ARC-AGI-1verified-v1-613c385b0c93 · 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-be40992860f9 · 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 Document Arenadocument-2026-09-13-a64ca3b12b6e · arena_rating · statistical tie | 1,484.48100% of row best · rating · gpt-5.5-high; 95% CI [1478.10008380, 1490.85597001]; votes 20944; rank 9 | 1,482.71100% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1473.91086026, 1491.51379085]; votes 4818; rank 10 |
| LMArena Search Arenasearch-2026-10-13-a64ca3b12b6e · arena_rating · leader | 1,246.5599% of row best · rating · gpt-5.5-search; 95% CI [1241.65410036, 1251.45490149]; votes 125957; rank 4 | 1,261.13100% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1254.84060485, 1267.42091382]; votes 60437; rank 1 |
| LMArena Text Arenatext-2026-10-15-a64ca3b12b6e · arena_rating · leader | 1,466.80100% of row best · rating · gpt-5.5; 95% CI [1463.14500791, 1470.45729846]; votes 70985; rank 35 | 1,457.0699% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1452.73485432, 1461.39117296]; votes 40442; rank 43 |
| LMArena Vision Arenavision-2026-10-09-a64ca3b12b6e · arena_rating · statistical tie | 1,292.31100% of row best · rating · gpt-5.5-high; 95% CI [1286.39749993, 1298.21557690]; votes 26281; rank 26 | 1,281.3999% of row best · rating · gpt-5.6-sol-xhigh; 95% CI [1273.98131322, 1288.80759068]; votes 10907; rank 35 |
| LiveBench2026-06-25-90f8d44da965 · 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 |
| ToneBench2026-10-17-10-task-e9c76358afb2 · overall_score · unverified | 76.7693% of row best · points · GPT-5.5 (xhigh) · 3,939 output tokens / case | 82.35100% of row best · points · GPT-5.6 Sol (ultra) · 15,714 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 2 ties | 1 benchmark win | 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.
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 | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,050K | 1,050K |
| 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 |
GPT-5.5 Capabilities
GPT-5.6 Sol Capabilities
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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 $4.00 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 $20.00 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?+
Both models have the same sourced context window: 1,050,000 tokens each.
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 7 protocol-matched benchmarks from 3 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 sourced 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 documented with image input; GPT-5.6 Sol is 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?+
Both models have the same sourced maximum output: 128,000 tokens each.
Do GPT-5.5 and GPT-5.6 Sol support reasoning and tool use?+
GPT-5.5: reasoning, tool calling, and image input. GPT-5.6 Sol: reasoning, tool calling, and image input. 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.