GPT-5.5 vs GPT-6 Astra
Model Markets Rankings
Intelligence, Cost, and Efficiency
| Ranking | GPT-5.5 | GPT-6 Astra |
|---|---|---|
| IntelligenceHigher is better · MM Intelligence v1.2 | #5 of 2284.2 score | UnrankedNot in the 22-model eligible cohort |
| CostLower is better · Published-token output estimate | #32 of 36$0.341 per LiveBench case | UnrankedNot in the 36-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.0 | #10 of 2252.7 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-5.5 | GPT-6 Astra |
|---|---|---|
| ARC-AGI-1verified-v1-2aa739d957fc · verified_score · leader | 95.0096% of row best · percent · GPT-5.5 (XHigh) | 98.50100% of row best · percent · GPT-6 Astra (XHigh) |
| ARC-AGI-2verified-v2-b5cb5ec6e8c7 · verified_score · leader | 85.0089% of row best · percent · GPT-5.5 (XHigh) | 95.00100% of row best · percent · GPT-6 Astra (Max) |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark wins | 2 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-6 Astra |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Family | Gpt 5 5 | Gpt 6 |
| Model | GPT-5.5 | GPT-6 Astra |
| Version | GPT-5.5 | GPT-6 Astra |
| Lifecycle | active | active |
| Released | 2026-04-23 | 2026-09-03 |
| Knowledge cutoff | 2025-12-01 | 2026-04-30 |
| 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, computer-use, generation, reasoning, research, tools |
15 comparable fields · 6 material differences · Pair passes the primary-source comparison gate
GPT-5.5 Capabilities
GPT-6 Astra Capabilities
Internal Comparison Graph
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Primary Evidence
Sources and Freshness
Questions
GPT-5.5 vs GPT-6 Astra FAQs
Is GPT-5.5 or GPT-6 Astra better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.5 and GPT-6 Astra, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.5 or GPT-6 Astra?+
GPT-5.5 is $5.00 and GPT-6 Astra is $10.00 per million tokens, so GPT-5.5 is cheaper on this metric. GPT-5.5 is $30.00 and GPT-6 Astra is $50.00 per million tokens, so GPT-5.5 is cheaper on this metric.
Which has a larger context window, GPT-5.5 or GPT-6 Astra?+
Neither model has a larger sourced context window in this comparison. GPT-5.5 is 1,050K and GPT-6 Astra is 1,050K.
Which performs better in benchmarks, GPT-5.5 or GPT-6 Astra?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can GPT-5.5 or GPT-6 Astra be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.5 is not marked open weight; GPT-6 Astra is not marked open weight.
Can GPT-5.5 and GPT-6 Astra understand images?+
GPT-5.5 is documented with image input; GPT-6 Astra is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.5 or GPT-6 Astra?+
Neither has a larger sourced maximum output. GPT-5.5 is 128K and GPT-6 Astra is 128K.
Do GPT-5.5 and GPT-6 Astra support reasoning and tool use?+
GPT-5.5: reasoning, tool calling, and image input. GPT-6 Astra: 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-6 Astra?+
GPT-5.5 has 2 sourced provider routes; GPT-6 Astra has 2, a tie.
Which offers better value, GPT-5.5 or GPT-6 Astra?+
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.