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GPT-5.5 openai
Release timeline
Stages observed by the nightly radar: announced → API only → weights public → served by third parties. Each entry carries the source it was seen at.
- 2026-04-24 · API only source seeded from the earliest dated observation when first seen · observed 2026-10-07 20:20 UTC
Description
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
via OpenRouter listing · observed 2026-10-24 21:26 UTC. The listing text is the provider's own description, not an assessment.
Where to run 3 providers · 7 endpoints
Hosted endpoints observed for GPT-5.5, sorted by input price (USD per million tokens). Each row names its observer and date; prices change daily, so check the source before quoting. Cheapest observed input price: $2.50/M.
| Provider | Model ref | Context | Quant | $/M in | $/M out | tok/s | TTFT | Tools | Status | Observed |
|---|---|---|---|---|---|---|---|---|---|---|
| OpenAI openrouter | openai/gpt-5.5 | 1.0M | unknown | $2.50 | $15.00 | — | — | yes | live | 2026-10-24 |
| Azure openrouter | openai/gpt-5.5 | 1.0M | unknown | $5.00 | $30.00 | — | — | yes | live | 2026-10-24 |
| OpenAI openrouter | openai/gpt-5.5 | 1.0M | unknown | $5.00 | $30.00 | — | — | yes | live | 2026-10-24 |
| Amazon Bedrock openrouter | openai/gpt-5.5 | 1.0M | unknown | $5.50 | $33.00 | — | — | yes | live | 2026-10-24 |
| Azure openrouter | openai/gpt-5.5 | 1.0M | unknown | $5.50 | $33.00 | — | — | yes | live | 2026-10-24 |
| Azure openrouter | openai/gpt-5.5 | 1.0M | unknown | $5.50 | $33.00 | — | — | yes | live | 2026-10-24 |
| OpenAI openrouter | openai/gpt-5.5 | 1.0M | unknown | $12.50 | $75.00 | — | — | yes | live | 2026-10-24 |
Third-party providers observed: 1 (Amazon Bedrock). Cache-read price $0.50/M (source, observed 2026-10-24).
Facts
| Context length | 1,050,000 tokens (1.0M) · OpenRouter listing |
|---|---|
| Modalities | file + image + text → text |
| Max completion tokens | 128,000 |
| Knowledge cutoff | 2025-12-01 |
| Supported parameters | include_reasoning, max_completion_tokens, max_tokens, reasoning, reasoning_effort, response_format, seed, structured_outputs, tool_choice, tools, verbosity |
| Openness | Closed weights · closed lab |
| Stage | API only |
| Confidence | medium |
| Pricing (USD per M tokens) |
in $5.00 · out $30.00 · cache read $0.50 OpenRouter list price (cheapest live endpoint) · source · observed 2026-10-24 21:26 UTC |
Open alternatives 5
Nearest open-weights models by modality, context and price on this watch list. Not a quality ranking.
| Model | Org | Params | Context | $/M in | License | Why it is here |
|---|---|---|---|---|---|---|
| Qwen3.5-4B | Qwen | 4.66B | 256K | — | apache-2.0 | vision input |
| Kimi-K3 | moonshotai | 2.78T | 1M | $0.23 | other | similar context (1.05M), cheaper input price ($0.2261/M vs $5/M), vision input |
| MiniMax-M3 | MiniMaxAI | 427B | 1M | $0.22 | other | similar context (1.05M), cheaper input price ($0.224/M vs $5/M), vision input |
| Llama-3.2-11B-Vision-Instruct | meta-llama | 10.7B | — | — | llama3.2 | vision input |
| Qwen3-VL-4B-Instruct | Qwen | 4.44B | 256K | — | apache-2.0 | vision input |
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- /feeds/upcoming.xml(RSS 2.0) · upcoming and just-released models, one item per entry
- /feeds/upcoming.json(JSON Feed 1.1) · same, JSON Feed 1.1
Email alerts are not open yet; the feeds above are the same data. See feeds for the item schema.
Sources
- openrouter openai/gpt-5.5 · observed 2026-10-24 21:26 UTC
Radar run: 2026-10-25 06:51 UTC · Last verified 2026-10-25 06:51 UTC