GPT-5.5 vs GPT-5.5 Instant

Name: GPT-5.5
Author: OpenAI

GPT-5.5 (2026) and GPT-5.5 Instant (2026) are frontier reasoning models from OpenAI. GPT-5.5 ships a 1.05m-token context window, while GPT-5.5 Instant ships a 400k-token context window. On pricing, GPT-5.5 ranges from $5 to $10/1M input tokens by tier; GPT-5.5 Instant costs $5/1M input tokens. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

GPT-5.5 Instant is safer overall; choose GPT-5.5 when coding workflow support matters.

Decision scorecard

Local evidence first

Signal	GPT-5.5	GPT-5.5 Instant	How to read it
Best for	reasoning-heavy apps, multimodal apps, and tool-calling agents	multimodal apps and tool-calling agents	Use-case synthesis from product type, capability flags, context, and provider data.
Decision fit	Coding, RAG, and Agents	Coding, RAG, and Agents	Primary workload tags from local decision data.
Context window	1.05m	400k	Higher is better when prompts, retrieval chunks, or transcripts are large.
Cheapest output	$30/1M tokens	$30/1M tokens	Cheapest tracked provider route; verify your exact region and tier.
Provider routes	3 tracked	1 tracked	Broader coverage can reduce vendor lock-in and fallback risk.
Shared benchmarks	0 rows	0 rows	No shared benchmark rows are sourced for this pair yet.

Decision tradeoffs

Choose GPT-5.5 when...

GPT-5.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
GPT-5.5 has broader tracked provider coverage for fallback and procurement flexibility.
GPT-5.5 uniquely exposes Reasoning in local model data.
Local decision data tags GPT-5.5 for Coding, RAG, and Agents.

Choose GPT-5.5 Instant when...

Local decision data tags GPT-5.5 Instant for Coding, RAG, and Agents.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Same estimate Tie

Requests / monthInput tokens / requestOutput tokens / request

GPT-5.5

$11,500

Cheapest tracked route/tier: OpenAI API 0-272K input tokens

GPT-5.5 Instant

$11,500

Cheapest tracked route/tier: OpenAI API

Estimated monthly gap: $0.00. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

GPT-5.5 -> GPT-5.5 Instant

Provider overlap exists on OpenAI API; start route-level A/B tests there.
Cheapest tracked output pricing is tied, so migration risk shifts to quality, latency, and provider packaging.
Check replacement coverage for Reasoning before moving production traffic.

GPT-5.5 Instant -> GPT-5.5

Provider overlap exists on OpenAI API; start route-level A/B tests there.
Cheapest tracked output pricing is tied, so migration risk shifts to quality, latency, and provider packaging.
GPT-5.5 adds Reasoning in local capability data.

Specs

Specification	GPT-5.5 OpenAI	GPT-5.5 Instant OpenAI
Released	2026-04-23	2026-05-05
Context window	1.05m	400k
Parameters	—	—
Architecture	decoder only	decoder only
License	Proprietary	Proprietary
Knowledge cutoff	2025-12	2025-08

Pricing and availability

Pricing attribute	GPT-5.5	GPT-5.5 Instant
Input price	0-272K input tokens $5/1M tokens Standard GPT-5.5 token pricing before the long-context surcharge threshold. 0-272,000t $5/1M tokens 272K+ input tokens $8/1M tokens Long-context surcharge applies above 272K input tokens for the full session. 272,000t+ $10/1M tokens	$5/1M tokens
Output price	0-272K input tokens $30/1M tokens Standard GPT-5.5 token pricing before the long-context surcharge threshold. 0-272,000t $30/1M tokens 272K+ input tokens $36/1M tokens Long-context surcharge applies above 272K input tokens for the full session. 272,000t+ $45/1M tokens	$30/1M tokens
Providers	OpenAI API OpenRouter Vercel AI Gateway	OpenAI API

Capabilities

Capability	GPT-5.5	GPT-5.5 Instant
Vision	Yes	Yes
Multimodal	Yes	Yes
Reasoning	Yes	No
Function calling	Yes	Yes
Tool use	Yes	Yes
Structured outputs	Yes	Yes
Code execution	Yes	Yes
IDE integration	No	No
Computer use	No	No
Parallel agents	No	No

Benchmarks

No shared benchmark rows are currently sourced for this pair.

Deep dive

The capability footprint differs most on reasoning mode: GPT-5.5. Both models share vision, multimodal input, function calling, and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.

For cost, GPT-5.5 lists tiered pricing: 0-272K input tokens is $5/1M input and $30/1M output; 0-272,000t is $5/1M input and $30/1M output; 272K+ input tokens is $8/1M input and $36/1M output; 272,000t+ is $10/1M input and $45/1M output, while GPT-5.5 Instant lists $5/1M input and $30/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend is tied on the cheapest tracked routes. For tiered rows, this cheapest-track view can understate interactive or fast-lane spend, so compare the tier you will actually use. Availability is 3 providers versus 1, so concentration risk also matters.

Choose GPT-5.5 when coding workflow support, larger context windows, and broader provider choice are central to the workload. Choose GPT-5.5 Instant when coding workflow support are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.

FAQ

Which has a larger context window, GPT-5.5 or GPT-5.5 Instant?

GPT-5.5 supports 1.05m tokens, while GPT-5.5 Instant supports 400k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.

Which is cheaper, GPT-5.5 or GPT-5.5 Instant?

Neither is cheaper on tracked token pricing. Both list $5/1M input and $30/1M output tokens on the cheapest tracked route. Provider discounts, batch pricing, or route-specific tiers can still change the final bill.

Is GPT-5.5 or GPT-5.5 Instant open source?

GPT-5.5 is listed under Proprietary. GPT-5.5 Instant is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.

Which is better for vision, GPT-5.5 or GPT-5.5 Instant?

Both GPT-5.5 and GPT-5.5 Instant expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.

Which is better for multimodal input, GPT-5.5 or GPT-5.5 Instant?

Both GPT-5.5 and GPT-5.5 Instant expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.

Where can I run GPT-5.5 and GPT-5.5 Instant?

GPT-5.5 is available on OpenAI API, OpenRouter, and Vercel AI Gateway. GPT-5.5 Instant is available on OpenAI API. Provider coverage can affect latency, region availability, compliance posture, and fallback options.

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Model pages

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Last reviewed: 2026-06-03. Data sourced from public model cards and provider documentation.