Migrating from gpt-5.3-codex to gpt-6-sol
What changes when you move from gpt-5.3-codex to gpt-6-sol: input price +14.3%, output price −28.6%, context window 400,000 → 1,050,000 tokens.
- From
- gpt-5.3-codex
- Status
- Deprecated
- Shutdown
- Apr 1, 2027
- Time left
- 168 days
- Status
- Active
- Shutdown
- none announced
- Time left
- —
Prices
USD per 1M tokens, standard tier| Type | gpt-5.3-codex | gpt-6-sol | Change |
|---|---|---|---|
| Input | $1.75first seen October 1, 2026 · source | $2.00first seen October 1, 2026 · source | +14.3% |
| Cached input | $0.175first seen October 1, 2026 · source | $0.20first seen October 1, 2026 · source | +14.3% |
| Output | $14.00first seen October 1, 2026 · source | $10.00first seen October 1, 2026 · source | −28.6% |
At 1M input and 250K output tokens a month: $5.25 on gpt-5.3-codex, $4.50 on gpt-6-sol (−14.3%).
Other tiers, prompt-size bands and modalities are on each model's page.
Limits
Tokens| Limit | gpt-5.3-codex | gpt-6-sol | Change |
|---|---|---|---|
| Context window | 400,000 tokensin place when tracking began (October 6, 2026) · source | 1,050,000 tokensin place when tracking began (October 7, 2026) · source | +162.5% |
| Max output tokens | 128,000 tokensin place when tracking began (October 6, 2026) · source | 128,000 tokensin place when tracking began (October 7, 2026) · source | 0% |
Benchmarks
Same benchmark and source on both sides; settings named where they differ| Benchmark | gpt-5.3-codex | gpt-6-sol | Change |
|---|---|---|---|
| Arena WebDevArena, max effort (vs codex harness). Ranges don't overlap. | 1371 ±11 | 1686 ±11 | +315 |
A score from one source is never compared with another source's, and company-reported scores are compared only within the same company; settings named where they differ. Data: Arena (arena.ai), CC BY 4.0.
Features and parameters
Compare models- Batch API: not supported on gpt-5.3-codex, supported on gpt-6-sol.gpt-5.3-codex: in place when tracking began (October 6, 2026) · source · gpt-6-sol: in place when tracking began (October 7, 2026) · source
Same on both
- Structured outputs: supported on both.gpt-5.3-codex: in place when tracking began (October 6, 2026) · source · gpt-6-sol: in place when tracking began (October 7, 2026) · source
- Function calling: supported on both.gpt-5.3-codex: in place when tracking began (October 6, 2026) · source · gpt-6-sol: in place when tracking began (October 7, 2026) · source
- Prompt caching: supported on both.gpt-5.3-codex: in place when tracking began (October 6, 2026) · source · gpt-6-sol: in place when tracking began (October 7, 2026) · source
- Image input: supported on both.gpt-5.3-codex: in place when tracking began (October 6, 2026) · source · gpt-6-sol: in place when tracking began (October 7, 2026) · source
- Reasoning / thinking: supported on both.gpt-5.3-codex: in place when tracking began (October 6, 2026) · source · gpt-6-sol: in place when tracking began (October 7, 2026) · source
- Fine-tuning: not supported on both.gpt-5.3-codex: in place when tracking began (October 6, 2026) · source · gpt-6-sol: in place when tracking began (October 7, 2026) · source
- Built-in web search: supported on both.gpt-5.3-codex: in place when tracking began (October 6, 2026) · source · gpt-6-sol: in place when tracking began (October 7, 2026) · source
Not published for gpt-5.3-codex: PDF input, temperature parameter, top_p parameter, logprobs.
Not published for gpt-6-sol: PDF input, temperature parameter, top_p parameter, logprobs.
Free tier
gpt-5.3-codex: no free tier listed
gpt-6-sol: Free for shared data, 1M tokens a day for Launch and Grow (250K for Build), in place when tracking began (October 12, 2026) (source) · All free models
gpt-6-sol adds a free tier.
Aliases
All aliasesNo aliases point at either model.
On cloud platforms
All platform dates| Model | Platform | Platform ID | Shutdown | Time left |
|---|---|---|---|---|
| gpt-5.3-codex | Microsoft Foundryversion 2026-02-24 | gpt-5.3-codex | Aug 24, 2027Active | 313 days |
Read daily from each platform's own pages. The status above uses each company's own date. Time left counts to 00:00 UTC on the shutdown date, which is the evening before in ET.
Checklist
- Change the model string from
gpt-5.3-codextogpt-6-sol. - Re-check costs: gpt-6-sol costs more than gpt-5.3-codex (input +14.3%).
Counting to 8:00 pm ET on March 31, 2027, which is 00:00 UTC on April 1, 2027.
Compared from AIWire's published data when this page loaded. Each fact links to the page it came from. Model pages: gpt-5.3-codex, gpt-6-sol.